Update version number

app/build.gradle

@@ -8,8 +8,8 @@ android {
         buildConfigField "boolean", "HIDDEN_APP", "false"
         minSdkVersion 15
         targetSdkVersion 28
-        versionCode 55
-        versionName '5.18'
+        versionCode 56
+        versionName '5.19'
     }
 
     lintOptions {