lint for spaces before colon

Author: leebyron

spec/Section 2 -- Language.md

@@ -566,14 +566,14 @@ will be present and `friends` will not.
 
 ```js
 {
-  "profiles" : [
+  "profiles": [
     {
-      "handle" : "zuck",
-      "friends" : { "count" : 1234 }
+      "handle": "zuck",
+      "friends": { "count" : 1234 }
     },
     {
-      "handle" : "cocacola",
-      "likers" : { "count" : 90234512 }
+      "handle": "cocacola",
+      "likers": { "count" : 90234512 }
     }
   ]
 }

spec/Section 4 -- Introspection.md

@@ -37,7 +37,7 @@ would return
 ```js
 {
   "__type": {
-    "name" : "User",
+    "name": "User",
     "fields": [
       {
         "name": "id",
@@ -109,8 +109,8 @@ and `__type` which are accessible from the type of the root of a query
 operation.
 
 ```
-__schema : __Schema!
-__type(name: String!) : __Type
+__schema: __Schema!
+__type(name: String!): __Type
 ```
 
 These fields are implicit and do not appear in the fields list in the root type

spec/Section 5 -- Validation.md

@@ -42,7 +42,7 @@ type Dog implements Pet {
   name: String!
   nickname: String
   barkVolume: Int
-  doesKnowCommand(dogCommand: DogCommand!) : Boolean!
+  doesKnowCommand(dogCommand: DogCommand!): Boolean!
   isHousetrained(atOtherHomes: Boolean): Boolean!
   owner: Human
 }
@@ -69,7 +69,7 @@ enum CatCommand { JUMP }
 type Cat implements Pet {
   name: String!
   nickname: String
-  doesKnowCommand(catCommand: CatCommand!) : Boolean!
+  doesKnowCommand(catCommand: CatCommand!): Boolean!
   meowVolume: Int
 }