fix(package): update i18next to version 17.0.17

Closes #129

Author: greenkeeper[bot]

package.json

@@ -9,7 +9,7 @@
     "date-fns": "^2.0.0-alpha.27",
     "deepmerge": "^3.2.0",
     "firebase": "^5.11.0",
-    "i18next": "^15.1.0",
+    "i18next": "^17.0.17",
     "prop-types": "^15.7.2",
     "react": "^16.8.6",
     "react-dom": "^16.8.6",