fix(package): update apollo-cache-inmemory to version 1.6.3

Closes #570

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     "@zeit/next-source-maps": "0.0.4-canary.1",
     "accepts": "^1.3.4",
     "antd": "3.8.4",
-    "apollo-cache-inmemory": "1.6.2",
+    "apollo-cache-inmemory": "1.6.3",
     "apollo-client": "2.6.3",
     "apollo-link": "1.2.5",
     "apollo-link-error": "^1.0.9",