Use HTTPS links

CHANGELOG.md

@@ -1,5 +1,5 @@
 # Change Log
-This project adheres to [Semantic Versioning](http://semver.org/).
+This project adheres to [Semantic Versioning](https://semver.org/).
 
 ## 8.1.7
 * Fix `import` support in TypeScript (by Remco Haszing).

README.md

@@ -60,7 +60,7 @@ on top of PostCSS.
 
 If you have any new ideas, [PostCSS plugin development] is really easy.
 
-[searchable catalog]: http://postcss.parts
+[searchable catalog]: https://www.postcss.parts/
 [plugins list]:       https://github.com/postcss/postcss/blob/master/docs/plugins.md
 
 
@@ -139,7 +139,7 @@ If you have any new ideas, [PostCSS plugin development] is really easy.
 [`colorguard`]:                 https://github.com/SlexAxton/css-colorguard
 [`stylelint`]:                  https://github.com/stylelint/stylelint
 [`stylefmt`]:                   https://github.com/morishitter/stylefmt
-[`cssnano`]:                    http://cssnano.co
+[`cssnano`]:                    https://cssnano.co/
 [`precss`]:                     https://github.com/jonathantneal/precss
 [`doiuse`]:                     https://github.com/anandthakker/doiuse
 [`rtlcss`]:                     https://github.com/MohammadYounes/rtlcss
@@ -190,8 +190,8 @@ you can write a parser and/or stringifier to extend PostCSS.
 ## Articles
 
 * [Some things you may think about PostCSS… and you might be wrong](http://julian.io/some-things-you-may-think-about-postcss-and-you-might-be-wrong)
-* [What PostCSS Really Is; What It Really Does](http://davidtheclark.com/its-time-for-everyone-to-learn-about-postcss)
-* [PostCSS Guides](http://webdesign.tutsplus.com/series/postcss-deep-dive--cms-889)
+* [What PostCSS Really Is; What It Really Does](https://davidtheclark.com/its-time-for-everyone-to-learn-about-postcss/)
+* [PostCSS Guides](https://webdesign.tutsplus.com/series/postcss-deep-dive--cms-889)
 
 More articles and videos you can find on [awesome-postcss](https://github.com/jjaderg/awesome-postcss) list.
 
@@ -208,7 +208,7 @@ You can start using PostCSS in just two steps:
 1. Find and add PostCSS extensions for your build tool.
 2. [Select plugins] and add them to your PostCSS process.
 
-[Select plugins]: http://postcss.parts
+[Select plugins]: https://www.postcss.parts/
 
 
 ### CSS-in-JS

docs/guidelines/plugin.md

@@ -7,7 +7,7 @@ The rules below are *mandatory* for all PostCSS plugins.
 
 See also [ClojureWerkz’s recommendations] for open source projects.
 
-[ClojureWerkz’s recommendations]:  http://blog.clojurewerkz.org/blog/2013/04/20/how-to-make-your-open-source-project-really-awesome/
+[ClojureWerkz’s recommendations]: http://blog.clojurewerkz.org/blog/2013/04/20/how-to-make-your-open-source-project-really-awesome/
 
 
 ## 1. API
@@ -268,9 +268,9 @@ Visit [Keep A Changelog] for more information about how to write one of these.
 
 Of course, you should be using [SemVer].
 
-[Keep A Changelog]: http://keepachangelog.com/
+[Keep A Changelog]: https://keepachangelog.com/
 [GitHub Releases]:  https://help.github.com/articles/creating-releases/
-[SemVer]:           http://semver.org/
+[SemVer]:           https://semver.org/
 
 
 ### 4.4. Include `postcss-plugin` keyword in `package.json`

docs/guidelines/runner.md

@@ -9,7 +9,7 @@ these rules are not mandatory but are highly recommended.
 
 See also [ClojureWerkz’s recommendations] for open source projects.
 
-[ClojureWerkz’s recommendations]:  http://blog.clojurewerkz.org/blog/2013/04/20/how-to-make-your-open-source-project-really-awesome/
+[ClojureWerkz’s recommendations]: http://blog.clojurewerkz.org/blog/2013/04/20/how-to-make-your-open-source-project-really-awesome/
 [`gulp-autoprefixer`]: https://github.com/sindresorhus/gulp-autoprefixer
 [`gulp‑postcss`]:      https://github.com/w0rm/gulp-postcss
 [`postcss-cli`]:       https://github.com/postcss/postcss-cli
@@ -138,9 +138,9 @@ Visit [Keep A Changelog] for more information on how to write one of these.
 
 Of course, you should use [SemVer].
 
-[Keep A Changelog]: http://keepachangelog.com/
+[Keep A Changelog]: https://keepachangelog.com/
 [GitHub Releases]:  https://help.github.com/articles/creating-releases/
-[SemVer]:           http://semver.org/
+[SemVer]:           https://semver.org/
 
 
 ### 4.3. `postcss-runner` keyword in `package.json`

docs/plugins.md

@@ -55,8 +55,8 @@ Or enable plugins directly in CSS using [`postcss-use`]:
 [`postcss-utilities`]:  https://github.com/ismamz/postcss-utilities
 [`postcss-hamster`]:    https://github.com/h0tc0d3/postcss-hamster
 [`stylelint`]:          https://github.com/stylelint/stylelint
-[`rucksack`]:           http://simplaio.github.io/rucksack
-[`cssnano`]:            http://cssnano.co/
+[`rucksack`]:           https://simplaio.github.io/rucksack
+[`cssnano`]:            https://cssnano.co/
 [`level4`]:             https://github.com/stephenway/level4
 [`precss`]:             https://github.com/jonathantneal/precss
 [`oldie`]:              https://github.com/jonathantneal/oldie
@@ -329,7 +329,7 @@ loosely resembles the original.
 * [`postcss-import`] inlines the stylesheets referred to by `@import` rules.
 * [`postcss-nested-import`] inlines stylesheets referred to by `@import` rules inside nested rule blocks.
 * [`postcss-partial-import`] inlines standard imports and Sass-like partials.
-* [`postcss-reference`] emulates Less’s [`@import (reference)`].
+* [`postcss-reference`] emulates Less’s `@import`.
 * [`postcss-remove-root`] removes all instances of `:root` from a stylesheet.
 * [`postcss-single-charset`] ensures that there is one and only one
   `@charset` rule at the top of file.
@@ -347,7 +347,6 @@ loosely resembles the original.
 
 See also plugins in modular minifier [`cssnano`].
 
-[@import (reference)]: http://lesscss.org/features/#import-options-reference
 [SVGO]: https://github.com/svg/svgo