Update the list of Erlang VMs to use on Travis-CI

.travis.yml

@@ -3,17 +3,15 @@ notifications:
   email: paul.joseph.davis@gmail.com
 script: make check
 otp_release:
+   - 19.1
+   - 19.0
+   - 18.3
+   - 18.2
    - 17.5
    - 17.4
-   - 17.3
-   - 17.1
-   - 17.0
    - R16B03-1
    - R16B02
-   - R16B01
    - R15B03
    - R15B02
-   - R15B01
    - R14B04
    - R14B03
-   - R14B02