Add golangci

In order to ensure the best possible code let's try and help our self by introducing golangci.

Author: boekkooi-fresh

.golangci.yml

@@ -0,0 +1,25 @@
+run:
+  build-tags:
+    - unit
+  skip-files:
+    - driver/inmemory/matcher_gen.go
+
+linters:
+  enable:
+    - maligned
+    - deadcode
+    - errcheck
+    - gosec
+    - goconst
+    - gocyclo
+    - gofmt
+    - goimports
+    - golint
+    - ineffassign
+    - interfacer
+    - staticcheck
+    - structcheck
+    - unconvert
+    - varcheck
+    - vet
+    - vetshadow

.travis.yml

@@ -8,13 +8,24 @@ addons:
   postgresql: '10'
 cache:
   directories:
+    - "$GOPATH/pkg/dep"
     - "$HOME/gopath/pkg/mod"
 env:
   global:
     - secure: 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
     - POSTGRES_DSN="postgres://postgres@localhost:5432/goengine?sslmode=disable&client_encoding=UTF8"
 
 matrix:
+  include:
+    - name: "GoLang CI lint"
+      go: 1.11.x
+      install:
+        - dep ensure -v
+        - curl -sfL https://install.goreleaser.com/github.com/golangci/golangci-lint.sh | sh -s -- -b $(go env GOPATH)/bin v1.15.0
+      before_script: []
+      script:
+        - golangci-lint run
+      after_success: []
   allow_failures:
     - go: master