readme: add link to blog post

josharian · Dec 16, 2019 · a140101 · a140101
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 Docs: https://godoc.org/github.com/josharian/intern
 
-See also [Go issue 5160](https://golang.org/issue/5160).
+For a blog post introducing string interning, see: https://commaok.xyz/post/intern-strings/
 
 License: MIT