Merge pull request #96 from hezhigang/master

to fix issue #90 - A problem occurred when run build file build.gradle

Author: kevin-wayne

build.gradle

@@ -78,6 +78,6 @@ bintray {
     }
 }
 
-task wrapper(type: Wrapper) {
-  gradleVersion = '2.4'
-}
+wrapper {
+  gradleVersion = '2.6'
+}