remove supportLibVersion property

android/gradle.properties

@@ -2,5 +2,4 @@ ReactNativeWebView_kotlinVersion=1.3.11
 ReactNativeWebView_compileSdkVersion=28
 ReactNativeWebView_buildToolsVersion=28.0.3
 ReactNativeWebView_targetSdkVersion=28
-ReactNativeWebView_supportLibVersion=28.0.0
 android.useAndroidX=true