Update CONTRIBUTING.md about the build tag

This is for Go 1.17.
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Hajime Hoshi 2021-06-24 14:08:50 +09:00 committed by GitHub
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@ -36,6 +36,7 @@ You don't have to update existing files' license comments.
## Adding build tags for examples
```go
//go:build example
// +build example
```