[CI] Add more checks (#43)

vendor/honnef.co/go/tools/simple/CONTRIBUTING.md

@@ -0,0 +1,15 @@
+# Contributing to gosimple
+
+## Before filing an issue:
+
+### Are you having trouble building gosimple?
+
+Check you have the latest version of its dependencies. Run
+```
+go get -u honnef.co/go/tools/simple
+```
+If you still have problems, consider searching for existing issues before filing a new issue.
+
+## Before sending a pull request:
+
+Have you understood the purpose of gosimple? Make sure to carefully read `README`.

vendor/honnef.co/go/tools/simple/lint17.go

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+// +build !go1.8
+
+package simple
+
+import "go/types"
+
+var structsIdentical = types.Identical

vendor/honnef.co/go/tools/simple/lint18.go

@@ -0,0 +1,7 @@
+// +build go1.8
+
+package simple
+
+import "go/types"
+
+var structsIdentical = types.IdenticalIgnoreTags