fix(deps): update dependency grpc to v1.21.1 (#629)

renovate[bot] · JustinBeckwith · commit fcf75a2e0ae8 · 2019-05-28T15:11:24.000Z
diff --git a/package.json b/package.json
@@ -63,7 +63,7 @@
     "extend": "^3.0.1",
     "google-auth-library": "^3.0.0",
     "google-gax": "^1.0.0",
-    "grpc": "1.20.3",
+    "grpc": "1.21.1",
     "is-stream-ended": "^0.1.4",
     "lodash.snakecase": "^4.1.1",
     "p-defer": "^2.0.1",
