[CI] Add more checks (#43)

vendor/honnef.co/go/tools/cmd/gosimple/README.md

@@ -0,0 +1,15 @@
+# gosimple
+
+_gosimple_ is a linter for Go source code that specialises on
+simplifying code.
+
+## Installation
+
+Gosimple requires Go 1.6 or later.
+
+    go get honnef.co/go/tools/cmd/gosimple
+
+## Documentation
+
+Detailed documentation can be found on
+[staticcheck.io](https://staticcheck.io/docs/gosimple).

vendor/honnef.co/go/tools/cmd/gosimple/gosimple.go

@@ -0,0 +1,21 @@
+// gosimple detects code that could be rewritten in a simpler way.
+package main // import "honnef.co/go/tools/cmd/gosimple"
+import (
+	"os"
+
+	"honnef.co/go/tools/lint/lintutil"
+	"honnef.co/go/tools/simple"
+)
+
+func main() {
+	fs := lintutil.FlagSet("gosimple")
+	gen := fs.Bool("generated", false, "Check generated code")
+	fs.Parse(os.Args[1:])
+	c := simple.NewChecker()
+	c.CheckGenerated = *gen
+	cfg := lintutil.CheckerConfig{
+		Checker:     c,
+		ExitNonZero: true,
+	}
+	lintutil.ProcessFlagSet([]lintutil.CheckerConfig{cfg}, fs)
+}