fix(deps): update dependency @google-cloud/promisify to v1 (#693)

renovate[bot] · JustinBeckwith · commit 5df2f833001c · 2019-05-03T07:30:52.000-07:00
diff --git a/package.json b/package.json
@@ -52,7 +52,7 @@
   "dependencies": {
     "@google-cloud/common": "^0.32.0",
     "@google-cloud/paginator": "^0.2.0",
-    "@google-cloud/promisify": "^0.4.0",
+    "@google-cloud/promisify": "^1.0.0",
     "arrify": "^2.0.0",
     "async": "^2.0.1",
     "compressible": "^2.0.12",
