Point rest urls to 'open'

app/src/main/java/chat/rocket/android/dagger/module/AppModule.kt

@@ -30,7 +30,7 @@ class AppModule {
 
             // TODO remove
             // TODO: From where should we get the url here?
-            restUrl = "https://unstable.rocket.chat"
+            restUrl = "https://open.rocket.chat"
         }
     }
 

app/src/main/java/chat/rocket/android/push/di/PushModule.kt

@@ -56,7 +56,7 @@ class PushModule(val context: FirebaseTokenService) {
     fun provideRocketChatClient(okHttpClient: OkHttpClient, repository: TokenRepository, logger: PlatformLogger): RocketChatClient {
         return RocketChatClient.create {
             httpClient = okHttpClient
-            restUrl = "https://unstable.rocket.chat"
+            restUrl = "https://open.rocket.chat"
             tokenRepository = repository
             platformLogger = logger
         }