fix(package): update @material-ui/core to version 3.9.3

Closes #175

Author: greenkeeper[bot]

package.json

@@ -32,7 +32,7 @@
   },
   "dependencies": {
     "@material-ui/codemod": "^1.1.0",
-    "@material-ui/core": "3.0.0",
+    "@material-ui/core": "3.9.3",
     "@material-ui/icons": "3.0.0",
     "algoliasearch": "^3.30.0",
     "apollo-cache-inmemory": "^1.1.12",