TUN-1734: Pin packages at exact versions

vendor/github.com/miekg/dns/.travis.yml

@@ -1,12 +1,11 @@
 language: go
 sudo: false
-go:
-  - 1.9.x
-  - tip
 
-env:
-  - TESTS="-race -v -bench=. -coverprofile=coverage.txt -covermode=atomic"
-  - TESTS="-race -v ./..."
+go:
+  - 1.10.x
+  - 1.11.x
+  - 1.12.x
+  - tip
 
 before_install:
   # don't use the miekg/dns when testing forks
@@ -14,7 +13,7 @@ before_install:
   - ln -s $TRAVIS_BUILD_DIR $GOPATH/src/github.com/miekg/ || true
 
 script:
-  - go test $TESTS
+  - go test -race -v -bench=. -coverprofile=coverage.txt -covermode=atomic ./...
 
 after_success:
   - bash <(curl -s https://codecov.io/bash)