Fix/vulnerabilities cheerio (#115)

* chore: Bump cheerio from 0.22.0 to 1.0.0-rc.10

* ⬆️ 🔒 Bump cheerio from 0.22.0 to 1.0.0-rc.10

* 🔥 Delete .nvmrc in list-stylesheets

* 🔥 Delete .nvmrc in  extract-css

* 🔥 Delete .nvmrc in style-data

* Delete .nvmrc

* ✅ use `js-beautify` to beautify html in tests

* 🚨 fix some lint issues

`eslint --fix index.js lib/ packages/`

Co-authored-by: siontama <siontama@naver.com>
Co-authored-by: Adrien Laugueux <adrien.laugueux@southpigalle.io>

Author: 3 people

lib/inline-css.js

@@ -83,6 +83,7 @@ module.exports = (html, css, options) => {
             // skip invalid selector
             return false;
         }
+        return undefined;
     });
 
     // flatten array if nested

lib/inlineContent.js

@@ -24,7 +24,7 @@ module.exports = function inlineContent(src, options) {
                 return reject(e);
             }
 
-            resolve(content);
+            return resolve(content);
         });
     });