Merge pull request #625 from lrascao/feature/travis_otp_19.1

Continuous integration on OTP 19.1
diff --git a/.travis.yml b/.travis.yml
index e4a3149..9589806 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -10,6 +10,7 @@
   - R14B03
   - 17.0
   - 18.0
+  - 19.1
 before_script:
   - hostname -f
   - cc -v