chore(deps-dev): bump rollup-plugin-postcss from 3.1.4 to 3.1.5 (#349)

Bumps [rollup-plugin-postcss](https://github.com/egoist/rollup-plugin-postcss) from 3.1.4 to 3.1.5.
- [Release notes](https://github.com/egoist/rollup-plugin-postcss/releases)
- [Changelog](https://github.com/egoist/rollup-plugin-postcss/blob/master/CHANGELOG-OLD.md)
- [Commits](egoist/rollup-plugin-postcss@v3.1.4...v3.1.5)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

Author: dependabot-preview[bot]

package.json

@@ -68,7 +68,7 @@
     "react-dom": "16.13.1",
     "rimraf": "3.0.2",
     "rollup-plugin-copy": "3.3.0",
-    "rollup-plugin-postcss": "3.1.4",
+    "rollup-plugin-postcss": "3.1.5",
     "rollup-plugin-typescript2": "0.27.2",
     "semantic-ui-css": "2.4.1",
     "semantic-ui-react": "1.1.1",

yarn.lock

@@ -11024,10 +11024,10 @@ rollup-plugin-copy@3.3.0:
     globby "10.0.1"
     is-plain-object "^3.0.0"
 
-rollup-plugin-postcss@3.1.4:
-  version "3.1.4"
-  resolved "https://registry.yarnpkg.com/rollup-plugin-postcss/-/rollup-plugin-postcss-3.1.4.tgz#b672dd6849d013f4b0c1ccff80ef54ff03817444"
-  integrity sha512-nLefjTDau8dpfEq1VSag1jjRizQc9/Io26mlC+/zkJVnvgKEz9xt3nvYW6vlOM0LffGFVapZNyr23Led1VN9Lw==
+rollup-plugin-postcss@3.1.5:
+  version "3.1.5"
+  resolved "https://registry.yarnpkg.com/rollup-plugin-postcss/-/rollup-plugin-postcss-3.1.5.tgz#4bcc19a7f95ab8fb17fb0ca59080fe3887421db2"
+  integrity sha512-oPD3ubb1JDBwzNMca+OZUpYxyxrIw9ihhUyvEbOwzzj0rR2UEKm8GtfhFXVGDWwBGp5HIK8ss/r8vRStYDddRA==
   dependencies:
     chalk "^4.0.0"
     concat-with-sourcemaps "^1.1.0"