android, ios: Update app name to "Zulip", from "Zulip beta"

Author: rajveermalviya

android/app/src/main/AndroidManifest.xml

@@ -5,7 +5,7 @@
 <manifest xmlns:android="http://schemas.android.com/apk/res/android">
    <uses-permission android:name="android.permission.INTERNET"/>
    <application
-        android:label="Zulip beta"
+        android:label="Zulip"
         android:name="${applicationName}"
         android:icon="@mipmap/ic_launcher">
         <activity

ios/Runner/Info.plist

@@ -7,15 +7,15 @@
 	<key>CFBundleDevelopmentRegion</key>
 	<string>$(DEVELOPMENT_LANGUAGE)</string>
 	<key>CFBundleDisplayName</key>
-	<string>Zulip beta</string>
+	<string>Zulip</string>
 	<key>CFBundleExecutable</key>
 	<string>$(EXECUTABLE_NAME)</string>
 	<key>CFBundleIdentifier</key>
 	<string>$(PRODUCT_BUNDLE_IDENTIFIER)</string>
 	<key>CFBundleInfoDictionaryVersion</key>
 	<string>6.0</string>
 	<key>CFBundleName</key>
-	<string>Zulip beta</string>
+	<string>Zulip</string>
 	<key>CFBundlePackageType</key>
 	<string>APPL</string>
 	<key>CFBundleShortVersionString</key>