Add OTP-22 as a CI target
diff --git a/.travis.yml b/.travis.yml
index 175deb4..72329f7 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -2,6 +2,7 @@
 
 os: linux
 otp_release:
+  - 22.0
   - 21.0
   - 20.0
   - 19.3