build universal apk (easier to give to people manually)

build.gradle

@@ -106,6 +106,7 @@ android {
 
     splits {
         abi {
+            universalApk true
             enable true
         }
     }
@@ -273,4 +274,4 @@ android {
         }
 
     }
-}
\ No newline at end of file
+}