fix(package): update i18next to version 19.4.3

Closes #27

Author: greenkeeper[bot]

package.json

@@ -48,7 +48,7 @@
     },
     "homepage": "https://github.com/koreezgames/phaser3-i18n-plugin#readme",
     "dependencies": {
-        "i18next": "^15.0.2",
+        "i18next": "^19.4.3",
         "i18next-xhr-backend": "^2.0.0"
     },
     "peerDependencies": {