2.0.0

The major version has to be released because of vulnerability in PostCSS (see [#165])

Changed

• Support optional dependencies [#168] (minifyUrl, minifyJs, removeUnusedCss, minifyCss). This might be a breaking change for you. Check the docs: https://github.com/posthtml/htmlnano/pull/168/files
• Disable mergeScripts & mergeStyles in the safe preset [#170].