CI: Build artifacts for master, not develop tags

See #443 for more information.

.travis.yml

@@ -58,5 +58,5 @@ deploy:
   skip_cleanup: true
   on:
     repo: raysan5/raylib
-    branch: develop
+    branch: master
     tags: true

appveyor.yml

@@ -61,5 +61,5 @@ deploy:
     prerelease: false
     force_update: true
     on:
-      branch: develop
+      branch: master
       appveyor_repo_tag: true        # deploy on tag push only