Update .travis.yml

golangci/golangci-lint#575
Avoid the above problems.

Author: tani-yu

.travis.yml

@@ -9,7 +9,7 @@ env:
 git:
   depth: 1
 before_script:
-  - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s v1.17.1
+  - curl -sfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s v1.13.2
 install: true
 notifications:
   slack: