Disable AppVeyor CI Pull Requests build

Build and test your Pull Requests yourself~

appveyor.yml

@@ -25,6 +25,10 @@ artifacts:
 pull_requests:
   do_not_increment_build_number: true
 
+skip_tags: true
+
+skip_branch_with_pr: true
+
 only_commits:
   files:
     - dalvikdx/
@@ -39,4 +43,4 @@ only_commits:
     - build.gradle
     - settings.gradle
     - gradle.properties
-    - appveyor.yml
+    - appveyor.yml