Update .travis.yml

Author: Martin Cox

.travis.yml

@@ -1,9 +1,9 @@
 language: erlang
-script: "make test"
-notifications:
-  webhooks: http://basho-engbot.herokuapp.com/travis?key=8b53d962594d0253d20002380cfb837fb81b928b
-  email: [email protected]
 otp_release:
-  - R15B01
-  - R15B
-  - R14B04
+  - 20.3.8
+script:
+  - chmod u+x rebar3
+  - ./rebar3 do upgrade, compile, dialyzer, xref, eunit
+notifications:
+  slack:
+    secure: SE0EMU9HenZlLBuNg7l6WLMxJPkfyAEGgodvAqMEuQmICtrh1nV019D/A8ykejYYPPsJafWVOfypOSDrSHCndzXvEZvU8l45nJ6XLdUdrDYEmvcSqN3EqmVSsuf9H3g99bvKygXaY27MkTS5ixLil7PzybG+YpwMnQGcQxYo5Eg=