Task collection improvements (#109)

vendor/github.com/urfave/cli/appveyor.yml

@@ -6,18 +6,23 @@ 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
   - go run build.go test
-  - go run build.go gfmrun
+  - go run build.go gfmrun docs/v1/manual.md