update go-cheatsheet

go-cheatsheet.md

@@ -1,5 +1,9 @@
 # go (golang) cheatsheet
 
+## external
+
+* awesome-go list of tools: [avelino/awesome-go](https://github.com/avelino/awesome-go)
+
 ## tools and environment
 
 goimports manages your import lines and should be used instead of fmt, golangci-lint will tell you when you're doing silly things, and gotest will do the same thing as `go test` but with color output in terminal.
@@ -54,4 +58,4 @@ Outputs types with keys, viz:
         ours:(*message.InnerJSONStruct)(nil),
         dstPubKey:(*cbk.CryptoBoxKey)(nil),
         srcPrivKey:(*cbk.CryptoBoxKey)(nil)}
-```
+```