fix(deps): update dependency pumpify to v2 (#515)

Author: renovate-bot

handwritten/bigtable/package.json

@@ -63,7 +63,7 @@
     "lodash.snakecase": "^4.1.1",
     "long": "^4.0.0",
     "protobufjs": "^6.8.0",
-    "pumpify": "^1.3.3",
+    "pumpify": "^2.0.0",
     "retry-request": "^4.0.0",
     "stream-events": "^1.0.2",
     "through2": "^3.0.0"