remove travis from required checks for merging PRs (#116)

diff --git a/.asf.yaml b/.asf.yaml
index b154e26..b132085 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -34,8 +34,6 @@
     master:
       required_status_checks:
         strict: true
-        contexts:
-          - "Travis CI - Pull Request"
       required_pull_request_reviews:
         required_appoving_review_count: 1
       required_signatures: false