https-ify sass-lang.com urls (#614)

See https://github.com/sass/sass-site/issues/217

Committed via https://github.com/asottile/all-repos

CODE_OF_CONDUCT.md

@@ -7,4 +7,4 @@ fair place to play.
 
 [The full community guidelines can be found on the Sass website.][link]
 
-[link]: http://sass-lang.com/community-guidelines
+[link]: https://sass-lang.com/community-guidelines

README.md

@@ -19,7 +19,7 @@ A [Dart][dart] implementation of [Sass][sass]. **Sass makes CSS fun again**.
 </table>
 
 [dart]: https://www.dartlang.org
-[sass]: http://sass-lang.com/
+[sass]: https://sass-lang.com/
 
 * [Using Dart Sass](#using-dart-sass)
   * [From Chocolatey (Windows)](#from-chocolatey-windows)

package/README.npm.md

@@ -16,7 +16,7 @@ A pure JavaScript implementation of [Sass][sass]. **Sass makes CSS fun again**.
   </tr>
 </table>
 
-[sass]: http://sass-lang.com/
+[sass]: https://sass-lang.com/
 
 This package is a distribution of [Dart Sass][], compiled to pure JavaScript
 with no native code or external dependencies. It provides a command-line `sass`

tool/grind/github.dart

@@ -77,7 +77,7 @@ String _releaseMessage() {
           version.replaceAll(".", "");
   return "To install Dart Sass $version, download one of the packages above "
       "and [add it to your PATH](https://katiek2.github.io/path-doc/), or see "
-      "[the Sass website](http://sass-lang.com/install) for full installation "
+      "[the Sass website](https://sass-lang.com/install) for full installation "
       "instructions.\n\n"
       "## Changes\n\n" +
       _lastChangelogSection() +