added "Rewrote the section about PostCSS" into the 1.3 changelog
added "Rewrote the section about PostCSS" into the 1.3 changelog

"[Rewrote the section about PostCSS](https://github.com/HugoGiraudel/sass-guidelines/pull/292/commits/7df1809c7a771e82202d7b910c542b3fd687d3f3)" seems to be merged into gh-pages (based on the 1.3 PR) but it's not mentioned in the Changelog.
HugoGiraudel/sass-guidelines,HugoGiraudel/sass-guidelines,HugoGiraudel/sass-guidelines,HugoGiraudel/sass-guidelines