Remove clippy-service update from CI

clippy-service hasn't been working for a long time now.

.travis.yml

@@ -73,20 +73,5 @@ after_success: |
     else
       echo "Not deploying, because we're in an integration test run"
     fi
-    # trigger rebuild of the clippy-service, to keep it up to date with clippy itself
-    if [ "$TRAVIS_PULL_REQUEST" == "false" ] &&
-       [ "$TRAVIS_REPO_SLUG" == "Manishearth/rust-clippy" ] &&
-       [ "$TRAVIS_BRANCH" == "master" ] &&
-       [ "$TRAVIS_TOKEN_CLIPPY_SERVICE" != "" ] ; then
-       curl -s -X POST \
-          -H "Content-Type: application/json" \
-          -H "Accept: application/json" \
-          -H "Travis-API-Version: 3" \
-          -H "Authorization: token $TRAVIS_TOKEN_CLIPPY_SERVICE" \
-          -d "{ \"request\": { \"branch\":\"master\" }}" \
-          https://api.travis-ci.org/repo/gnunicorn%2Fclippy-service/requests
-    else
-      echo "Ignored"
-    fi
     set +e
   fi