Add linting

Makefile

@@ -1,14 +1,17 @@
 export GOOS=windows
 
-fmt:
-	gofmt -l -w -s .
-
 build:
 	promu build -v
 
 test:
 	go test -v ./...
 
+lint:
+	gometalinter --vendor --config gometalinter.config ./...
+
+fmt:
+	gofmt -l -w -s .
+
 crossbuild:
 	# The prometheus/golang-builder image for promu crossbuild doesn't exist
 	# on Windows, so for now, we'll just build twice

appveyor.yml

@@ -12,11 +12,15 @@ clone_folder: c:\gopath\src\github.com\martinlindhe\wmi_exporter
 install:
   - set PATH=%GOPATH%\bin;%PATH%
   - go get -u github.com/prometheus/promu
+  - go get -u github.com/alecthomas/gometalinter && gometalinter --install
   - choco install gitversion.portable make -y
 
 test_script:
   - make test
 
+after_test:
+  - make lint
+
 build_script:
   - ps: |
       $ErrorActionPreference = "Stop"

gometalinter.config

@@ -0,0 +1 @@
+{}