Merge pull request #635 from tuncer/travis-otp-20

travis-ci: test with Erlang 20.0.2
diff --git a/.travis.yml b/.travis.yml
index 9589806..7af5258 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -11,6 +11,7 @@
   - 17.0
   - 18.0
   - 19.1
+  - 20.0.2
 before_script:
   - hostname -f
   - cc -v