fix(package): update expo to version 34.0.4

Closes #52

Author: greenkeeper[bot]

package.json

@@ -11,7 +11,7 @@
   "dependencies": {
     "exp": "^57.0.1",
     "@skpm/builder": "0.5.15",
-    "expo": "^32.0.0",
+    "expo": "^34.0.4",
     "react": "16.8.3",
     "react-dom": "^16.8.3",
     "react-native": "https://github.com/expo/react-native/archive/sdk-27.0.0.tar.gz",