Update bintray-release version to 0.5.0

Faced same issue as zhihu#51. and followed the fix from there. Need to update this to avoid issues for new users

build.gradle

@@ -21,7 +21,7 @@ buildscript {
     }
     dependencies {
         classpath 'com.android.tools.build:gradle:2.3.2'
-        classpath 'com.novoda:bintray-release:0.4.0'
+        classpath 'com.novoda:bintray-release:0.5.0'
     }
 }