Fix syntax error in README.md for password field

Author: PierreGode

README.md

@@ -41,7 +41,7 @@ In `~/MagicMirror/config/config.js`:
     id: '',
     hash_key: '',
     username: '',
-    password '',
+    password: '',
     displaySeasonAndEpisode: false,
     displayShowingOn: false,
     displayEpisodeName: false,