Bump postcss from 7.0.35 to 7.0.39

Bumps [postcss](https://github.com/postcss/postcss) from 7.0.35 to 7.0.39.
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/7.0.39/CHANGELOG.md)
- [Commits](https://github.com/postcss/postcss/compare/7.0.35...7.0.39)

---
updated-dependencies:
- dependency-name: postcss
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -39,7 +39,7 @@
         "jquery.easing": "^1.4.1"
     },
     "devDependencies": {
-        "browser-sync": "2.29.1",
+        "browser-sync": "2.26.14",
         "del": "6.0.0",
         "gulp": "4.0.2",
         "gulp-autoprefixer": "7.0.1",