Fix go get in AppVeyor

appveyor.yml

@@ -13,16 +13,19 @@ environment:
 
 # scripts that run after cloning repository
 install:
-  - set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
-  - go version
-  - go env
-  - go get
+- set PATH=%GOPATH%\bin;c:\go\bin;%PATH%
+- go version
+- go env
+- go get github.com/gorilla/handlers
+- go get github.com/gorilla/mux
+- go get github.com/gorilla/websocket
+- go get github.com/urfave/cli
 
 # to run your custom scripts instead of automatic MSBuild
 build_script:
-  - go vet ./...
-  - gofmt -s -l .
-  - make
+- go vet ./...
+- gofmt -s -l .
+- make
 
 # to disable automatic tests
 test: off