bump the internal Android version to 2 (versionName 0.2)

Author: tschudin

android/tinySSB/app/build.gradle

@@ -14,8 +14,8 @@ android {
         applicationId "nz.scuttlebutt.tremolavossbol"
         minSdk 24
         targetSdkVersion 30
-        versionCode 1
-        versionName "0.1"
+        versionCode 2
+        versionName "0.2"
 
         ndk {
             // abiFilters 'x86' // x86 needed for testing in the emulator