Update rack requirement from ~> 1.6 to >= 1.6, < 3.0

Updates the requirements on [rack](https://github.com/rack/rack) to permit the latest version.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/master/CHANGELOG.md)
- [Commits](rack/rack@1.6.4...2.0.7)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -12,15 +12,15 @@ PATH
       net-ssh
       paperclip (~> 4.3)
       puma (~> 2.14)
-      rack (~> 1.6)
+      rack (>= 1.6, < 3.0)
       sidekiq (~> 3.4)
       sucker_punch (~> 1.5)
       sys-filesystem (~> 0)
 
 GEM
   remote: https://rubygems.org/
   specs:
-    CFPropertyList (2.3.2)
+    CFPropertyList (2.3.6)
     activemodel (4.2.6)
       activesupport (= 4.2.6)
       builder (~> 3.1)
@@ -30,33 +30,37 @@ GEM
       minitest (~> 5.1)
       thread_safe (~> 0.3, >= 0.3.4)
       tzinfo (~> 1.1)
-    builder (3.2.2)
+    builder (3.2.3)
     celluloid (0.16.0)
       timers (~> 4.0.0)
-    climate_control (0.0.3)
-      activesupport (>= 3.0)
+    climate_control (0.2.0)
     cocaine (0.5.8)
       climate_control (>= 0.0.3, < 1.0)
     coderay (1.1.1)
-    connection_pool (2.2.0)
+    connection_pool (2.2.2)
     diff-lcs (1.2.5)
     disk_store (0.4.1)
       celluloid
       rake
-    excon (0.49.0)
+    dry-inflector (0.1.2)
+    excon (0.69.1)
     ffi (1.11.2)
     fission (0.5.0)
       CFPropertyList (~> 2.2)
-    fog (1.38.0)
+    fog (1.41.0)
       fog-aliyun (>= 0.1.0)
       fog-atmos
       fog-aws (>= 0.6.0)
       fog-brightbox (~> 0.4)
       fog-cloudatcost (~> 0.1.0)
-      fog-core (~> 1.32)
+      fog-core (~> 1.45)
+      fog-digitalocean (>= 0.3.0)
+      fog-dnsimple (~> 1.0)
       fog-dynect (~> 0.0.2)
       fog-ecloud (~> 0.1)
       fog-google (<= 0.1.0)
+      fog-internet-archive
+      fog-joyent
       fog-json
       fog-local
       fog-openstack
@@ -76,32 +80,42 @@ GEM
       fog-xenserver
       fog-xml (~> 0.1.1)
       ipaddress (~> 0.5)
-    fog-aliyun (0.1.0)
-      fog-core (~> 1.27)
-      fog-json (~> 1.0)
+      json (>= 1.8, < 2.0)
+    fog-aliyun (0.3.5)
+      fog-core
+      fog-json
       ipaddress (~> 0.8)
       xml-simple (~> 1.1)
     fog-atmos (0.1.0)
       fog-core
       fog-xml
-    fog-aws (0.9.3)
+    fog-aws (2.0.1)
       fog-core (~> 1.38)
       fog-json (~> 1.0)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-brightbox (0.10.1)
-      fog-core (~> 1.22)
+    fog-brightbox (0.16.1)
+      dry-inflector
+      fog-core
       fog-json
-      inflecto (~> 0.0.2)
+      mime-types
     fog-cloudatcost (0.1.2)
       fog-core (~> 1.36)
       fog-json (~> 1.0)
       fog-xml (~> 0.1)
       ipaddress (~> 0.8)
-    fog-core (1.40.0)
+    fog-core (1.45.0)
       builder
-      excon (~> 0.49)
+      excon (~> 0.58)
       formatador (~> 0.2)
+    fog-digitalocean (0.4.0)
+      fog-core
+      fog-json
+      fog-xml
+      ipaddress (>= 0.5)
+    fog-dnsimple (1.0.0)
+      fog-core (~> 1.38)
+      fog-json (~> 1.0)
     fog-dynect (0.0.3)
       fog-core
       fog-json
@@ -113,24 +127,30 @@ GEM
       fog-core
       fog-json
       fog-xml
-    fog-json (1.0.2)
-      fog-core (~> 1.0)
+    fog-internet-archive (0.0.1)
+      fog-core
+      fog-json
+      fog-xml
+    fog-joyent (0.0.1)
+      fog-core (~> 1.42)
+      fog-json (>= 1.0)
+    fog-json (1.2.0)
+      fog-core
       multi_json (~> 1.10)
-    fog-local (0.3.0)
-      fog-core (~> 1.27)
-    fog-openstack (0.1.6)
-      fog-core (>= 1.39)
+    fog-local (0.6.0)
+      fog-core (>= 1.27, < 3.0)
+    fog-openstack (0.3.10)
+      fog-core (>= 1.45, <= 2.1.0)
       fog-json (>= 1.0)
       ipaddress (>= 0.8)
-    fog-powerdns (0.1.1)
-      fog-core (~> 1.27)
-      fog-json (~> 1.0)
-      fog-xml (~> 0.1)
-    fog-profitbricks (0.0.5)
+    fog-powerdns (0.2.0)
       fog-core
+      fog-json
       fog-xml
-      nokogiri
-    fog-rackspace (0.1.1)
+    fog-profitbricks (4.1.1)
+      fog-core (~> 1.42)
+      fog-json (~> 1.0)
+    fog-rackspace (0.1.6)
       fog-core (>= 1.35)
       fog-json (>= 1.0)
       fog-xml (>= 0.1)
@@ -149,7 +169,7 @@ GEM
     fog-serverlove (0.1.2)
       fog-core
       fog-json
-    fog-softlayer (1.1.2)
+    fog-softlayer (1.1.4)
       fog-core
       fog-json
     fog-storm_on_demand (0.1.1)
@@ -164,17 +184,16 @@ GEM
     fog-voxel (0.1.0)
       fog-core
       fog-xml
-    fog-vsphere (0.8.0)
+    fog-vsphere (3.2.1)
       fog-core
-      rbvmomi (~> 1.8)
-    fog-xenserver (0.2.3)
+      rbvmomi (>= 1.9, < 3)
+    fog-xenserver (0.3.0)
       fog-core
       fog-xml
-    fog-xml (0.1.2)
+    fog-xml (0.1.3)
       fog-core
-      nokogiri (~> 1.5, >= 1.5.11)
-    foreman (0.82.0)
-      thor (~> 0.19.1)
+      nokogiri (>= 1.5.11, < 2.0.0)
+    foreman (0.86.0)
     formatador (0.2.5)
     guard (2.13.0)
       formatador (>= 0.2.4)
@@ -190,31 +209,31 @@ GEM
       guard (~> 2.1)
       guard-compat (~> 1.1)
       rspec (>= 2.99.0, < 4.0)
-    hitimes (1.2.4)
+    hitimes (2.0.0)
     i18n (0.7.0)
-    inflecto (0.0.2)
     ipaddress (0.8.3)
     json (1.8.3)
     listen (3.0.6)
       rb-fsevent (>= 0.9.3)
       rb-inotify (>= 0.9.7)
     lumberjack (1.0.10)
     method_source (0.8.2)
-    mime-types (3.1)
+    mime-types (3.3)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mime-types-data (3.2019.1009)
     mimemagic (0.3.0)
     mini_portile2 (2.4.0)
     minitest (5.8.4)
-    multi_json (1.12.1)
+    multi_json (1.14.1)
     nenv (0.3.0)
-    net-ssh (3.1.1)
+    net-ssh (4.2.0)
     nokogiri (1.9.1)
       mini_portile2 (~> 2.4.0)
     notiffany (0.0.8)
       nenv (~> 0.1)
       shellany (~> 0.0)
-    paperclip (4.3.6)
+    optimist (3.0.0)
+    paperclip (4.3.7)
       activemodel (>= 3.2.0)
       activesupport (>= 3.2.0)
       cocaine (~> 0.5.5)
@@ -225,18 +244,19 @@ GEM
       method_source (~> 0.8.1)
       slop (~> 3.4)
     puma (2.16.0)
-    rack (1.6.4)
-    rake (11.2.2)
+    rack (2.0.7)
+    rake (13.0.1)
     rb-fsevent (0.9.7)
     rb-inotify (0.9.7)
       ffi (>= 0.5.0)
-    rbvmomi (1.8.2)
-      builder
-      nokogiri (>= 1.4.1)
-      trollop
-    redis (3.3.0)
-    redis-namespace (1.5.2)
-      redis (~> 3.0, >= 3.0.4)
+    rbvmomi (2.2.0)
+      builder (~> 3.0)
+      json (>= 1.8)
+      nokogiri (~> 1.5)
+      optimist (~> 3.0)
+    redis (3.3.5)
+    redis-namespace (1.6.0)
+      redis (>= 3.0.4)
     rspec (3.4.0)
       rspec-core (~> 3.4.0)
       rspec-expectations (~> 3.4.0)
@@ -271,7 +291,6 @@ GEM
     thread_safe (0.3.5)
     timers (4.0.4)
       hitimes
-    trollop (2.1.2)
     tzinfo (1.2.2)
       thread_safe (~> 0.1)
     xml-simple (1.1.5)

attache.gemspec

@@ -19,7 +19,7 @@ Gem::Specification.new do |s|
   s.bindir      = 'exe'
   s.executables = ['attache']
 
-  s.add_runtime_dependency 'rack', '~> 1.6'
+  s.add_runtime_dependency 'rack', '>= 1.6', '< 3.0'
   s.add_runtime_dependency 'activesupport'
   s.add_runtime_dependency 'paperclip', '~> 4.3'
   s.add_runtime_dependency 'puma', '~> 2.14'