Add Dep installing steps

Author: agentmilindu

.github/workflows/main.yml

@@ -13,7 +13,7 @@ jobs:
     - uses: actions/checkout@v1
     - name: Build Dunner and run tests
       run: |
-        go get -d -u github.com/golang/dep
+        go install github.com/golang/dep/cmd/dep
         dep ensure
         go install
         dunner version