[readme] add CII Best Practices badge

Author: ljharb

readme.markdown

@@ -4,10 +4,9 @@ implements the [node `require.resolve()` algorithm](https://nodejs.org/api/modul
 
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 [![coverage][codecov-image]][codecov-url]
-[![dependency status][5]][6]
-[![dev dependency status][7]][8]
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+[![CII Best Practices](https://bestpractices.coreinfrastructure.org/projects/10759/badge)](https://bestpractices.coreinfrastructure.org/projects/10759)
 
 [![npm badge][11]][1]