remove travis from required checks for merging PRs (#228)

Author: dgrove-oss

.asf.yaml

@@ -38,8 +38,6 @@ github:
     master:
       required_status_checks:
         strict: false
-        contexts:
-          - "Travis CI - Pull Request"
       required_pull_request_reviews:
         required_appoving_review_count: 1
       required_signatures: false