Updated travis build conf

.travis.yml

 language: go
 
 go:
-  - 1.11.x
+  - 1.12.x
 
 env:
-  - DEP_VERSION="0.5.0"
+  - GO111MODULE=on
 
 # Anything in before_script that returns a nonzero exit code will flunk the
 # build and immediately stop. It's sorta like having set -e enabled in bash.
@@ -13,14 +13,8 @@ before_install:
   - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | bash -s -- -b $GOPATH/bin v1.10.2
   # Download the binary to bin folder in $GOPATH
   - curl -L -s https://github.com/golang/dep/releases/download/v${DEP_VERSION}/dep-linux-amd64 -o $GOPATH/bin/dep
-  # Make the binary executable
-  - chmod +x $GOPATH/bin/dep
 
-install:
-  # Check the dependency, -skip-lock may be useful because the version are not fixed but depends
-  # from the branch master of the libraries so they change very often
-  - dep check -skip-vendor
-  - dep ensure
+install: true
 
 script:
   # Check if the code is formatted
@@ -34,6 +28,3 @@ script:
 after_success:
   - bash <(curl -s https://codecov.io/bash)
 
-cache:
-  directories:
-    - $GOPATH/pkg/dep
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