appveyor: Removed the go deps installation

Author: ZapAnton

appveyor.yml

@@ -5,6 +5,7 @@ clone_folder: c:\gopath\src\github.com\exercism\cli
 
 environment:
   GOPATH: c:\gopath
+  GO111MODULE: on
 
 init:
   - git config --global core.autocrlf input
@@ -14,8 +15,6 @@ install:
   - echo %GOPATH%
   - go version
   - go env
-  - go get -u github.com/golang/dep/...
-  - c:\gopath\bin\dep.exe ensure
 
 build_script:
   - go test -cover ./...