Update version in build.gradle

Author: Philipp Middendorf

android/app/build.gradle

@@ -102,8 +102,8 @@ android {
         applicationId "de.php_tech.piggybudget"
         minSdkVersion rootProject.ext.minSdkVersion
         targetSdkVersion rootProject.ext.targetSdkVersion
-        versionCode 10
-        versionName "1.0"
+        versionCode 20
+        versionName "2.0"
         ndk {
             abiFilters "armeabi-v7a", "x86"
         }