Merge pull request #898 from urfave/lynncyrin-patch-1

Copy appveyor changes from the V2 PR

appveyor.yml

@@ -6,16 +6,21 @@ image: Visual Studio 2017
 
 clone_folder: c:\gopath\src\github.com\urfave\cli
 
+cache:
+  - node_modules
+
 environment:
   GOPATH: C:\gopath
   GOVERSION: 1.11.x
+  GO111MODULE: on
+  GOPROXY: https://proxy.golang.org
 
 install:
   - set PATH=%GOPATH%\bin;C:\go\bin;%PATH%
   - go version
   - go env
-  - go get github.com/urfave/gfmrun/...
-  - go get -v -t ./...
+  - go get github.com/urfave/gfmrun/cmd/gfmrun
+  - go mod vendor
 
 build_script:
   - go run build.go vet