Merge pull request #245 from prometheus/mr/remove-travis

Remove Travis CI

.travis.yml

@@ -1,13 +0,0 @@
-sudo: false
-
-language: go
-# Whenever the Go version is updated here, .circleci/config.yml and .promu.yml
-# should also be updated.
-go:
-- 1.12.x
-
-go_import_path: github.com/prometheus/statsd_exporter
-
-script:
-- make
-- git diff --exit-code