Update Gradle.gitignore

Unignore gradle-wrapper.properties. For context, see docs: https://docs.gradle.org/current/userguide/gradle_wrapper.html#sec:wrapper_generation

Author: jpayoung

Gradle.gitignore

@@ -8,6 +8,9 @@ gradle-app.setting
 # Avoid ignoring Gradle wrapper jar file (.jar files are usually ignored)
 !gradle-wrapper.jar
 
+# Avoid ignore Gradle wrappper properties
+!gradle-wrapper.properties
+
 # Cache of project
 .gradletasknamecache