Bump version to 2.3.2-beta and update fastlane metadata

fastlane/metadata/android/en-US/changelogs/84.txt

+## Fixed
+* Fix IllegalStateException in ContentController (#1022) 

mobile/build.gradle

@@ -33,8 +33,8 @@ android {
         applicationId "org.openhab.habdroid"
         minSdkVersion 14
         targetSdkVersion 27
-        versionCode 83
-        versionName "2.3.1-beta"
+        versionCode 84
+        versionName "2.3.2-beta"
         multiDexEnabled true
         testInstrumentationRunner 'android.support.test.runner.AndroidJUnitRunner'
     }