chore(package): update apollo-link-http to version 1.5.16

Closes #6033

Author: greenkeeper[bot]

package.json

@@ -65,7 +65,7 @@
     "apollo-cache-inmemory": "1.6.3",
     "apollo-client": "2.6.4",
     "apollo-link": "1.2.12",
-    "apollo-link-http": "1.5.15",
+    "apollo-link-http": "1.5.16",
     "apollo-link-ws": "1.0.18",
     "apollo-upload-client": "11.0.0",
     "apollo-utilities": "1.3.2",