fix(deps): update dependency gaxios to v2 (#681)

renovate[bot] · JustinBeckwith · commit 770ad2fa0b0a · 2019-05-03T08:35:41.000-07:00
diff --git a/package.json b/package.json
@@ -20,7 +20,7 @@
     "arrify": "^1.0.1",
     "base64-js": "^1.3.0",
     "fast-text-encoding": "^1.0.0",
-    "gaxios": "^1.2.1",
+    "gaxios": "^2.0.0",
     "gcp-metadata": "^1.0.0",
     "gtoken": "^2.3.2",
     "https-proxy-agent": "^2.2.1",
