remove travis from required checks for merging PRs (#16)

diff --git a/.asf.yaml b/.asf.yaml
index 7c9cb7f..c8ce7f6 100644
--- a/.asf.yaml
+++ b/.asf.yaml
@@ -36,8 +36,6 @@
     master:
       required_status_checks:
         strict: false
-        contexts:
-          - "Travis CI - Pull Request"
       required_pull_request_reviews:
         required_appoving_review_count: 1
       required_signatures: false