ci(travis): only run cover and versioning on push to branch

Author: Sergei Orlov

.travis.yml

@@ -9,9 +9,9 @@ cache:
 stages:
   - check
   - name: cover
-    if: branch = master AND type != push
+    if: branch = master AND type = push
   - name: versioning
-    if: branch = master AND type != push
+    if: branch = master AND type = push
   - name: publish
     if: tag IS present AND tag =~ ^v AND type != push