build: update travis build to use go modules, switch to go 1.11

.travis.yml

@@ -1,19 +1,12 @@
 language: go
 go:
-  - "1.9.4"
-  - "1.10"
+  - "1.11.x"
 sudo: false
-before_install:
-  - GLIDE_TAG=v0.12.3
-  - GLIDE_DOWNLOAD="https://github.com/Masterminds/glide/releases/download/$GLIDE_TAG/glide-$GLIDE_TAG-linux-amd64.tar.gz"
-  - curl -L $GLIDE_DOWNLOAD | tar -xvz
-  - export PATH=$PATH:$PWD/linux-amd64/
-  - glide install
 install:
-  - go install -v $(glide novendor)
-  - go get -v golang.org/x/tools/cmd/cover
-  - go get -v golang.org/x/lint/golint
-  - go get -v github.com/davecgh/go-spew/spew
+  - GO111MODULE=on go install -v ./...
+  - GO111MODULE=off go get -v golang.org/x/tools/cmd/cover
+  - GO111MODULE=off go get -v golang.org/x/lint/golint
+  - GO111MODULE=off go get -v github.com/davecgh/go-spew/spew
 script:
   - export PATH=$PATH:$HOME/gopath/bin
   - ./goclean.sh