Bump gatsby-plugin-sass from 2.1.31 to 2.2.0

Bumps [gatsby-plugin-sass](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-plugin-sass) from 2.1.31 to 2.2.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-plugin-sass/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-plugin-sass@2.2.0/packages/gatsby-plugin-sass)

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

package.json

@@ -13,7 +13,7 @@
     "gatsby-plugin-react-helmet": "^3.2.0",
     "gatsby-plugin-remove-serviceworker": "^1.0.0",
     "gatsby-plugin-robots-txt": "^1.5.0",
-    "gatsby-plugin-sass": "^2.1.31",
+    "gatsby-plugin-sass": "^2.2.0",
     "gatsby-plugin-sharp": "^2.4.13",
     "gatsby-source-filesystem": "^2.2.1",
     "gatsby-transformer-sharp": "^2.4.1",

yarn.lock

@@ -5660,10 +5660,10 @@ gatsby-plugin-robots-txt@^1.5.0:
     "@babel/runtime" "^7.5.1"
     generate-robotstxt "^7.1.0"
 
-gatsby-plugin-sass@^2.1.31:
-  version "2.1.31"
-  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.1.31.tgz#c51ef3a6ec5451955d05fd3b7117bf55baab584d"
-  integrity sha512-3+2rvNxnBBcCRtc13D8aC/m8K6GznPcWJRBYX1YHiLYYw547eQG2YheRGrp+mzjgx5rv3XUF6WsFXroEUGXyfg==
+gatsby-plugin-sass@^2.2.0:
+  version "2.2.0"
+  resolved "https://registry.yarnpkg.com/gatsby-plugin-sass/-/gatsby-plugin-sass-2.2.0.tgz#74ff9cb1f8d034b17a72f80ff995cd79ced282cf"
+  integrity sha512-KqjvuLX244zb6EAoF8izUMmaOgynAuLg0PSkqpvWLqtgeisZdbWkFJ8G3jH6CoATzFWUmoMkncsUCUW30eCmXw==
   dependencies:
     "@babel/runtime" "^7.8.7"
     sass-loader "^7.3.1"