fix: upgrade postcss from 7.0.30 to 7.0.31

Snyk has created this PR to upgrade postcss from 7.0.30 to 7.0.31.

See this package in NPM:
https://www.npmjs.com/package/postcss

See this project in Snyk:
https://app.snyk.io/org/aleshaoleg/project/46a454f2-8e92-4fd7-a46a-f490555a6dcc?utm_source=github&utm_medium=upgrade-pr

package.json

@@ -18,7 +18,7 @@
   "homepage": "https://github.com/AleshaOleg/postcss-sass",
   "dependencies": {
     "gonzales-pe": "^4.3.0",
-    "postcss": "^7.0.27"
+    "postcss": "^7.0.31"
   },
   "devDependencies": {
     "@babel/cli": "^7.5.5",

yarn.lock

@@ -4970,7 +4970,7 @@ postcss@^5.2.16:
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
-postcss@^7.0.0, postcss@^7.0.27:
+postcss@^7.0.0:
   version "7.0.30"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.30.tgz#cc9378beffe46a02cbc4506a0477d05fcea9a8e2"
   integrity sha512-nu/0m+NtIzoubO+xdAlwZl/u5S5vi/y6BCsoL8D+8IxsD3XvBS8X4YEADNIVXKVuQvduiucnRv+vPIqj56EGMQ==
@@ -4979,6 +4979,15 @@ postcss@^7.0.0, postcss@^7.0.27:
     source-map "^0.6.1"
     supports-color "^6.1.0"
 
+postcss@^7.0.31:
+  version "7.0.32"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.32.tgz#4310d6ee347053da3433db2be492883d62cec59d"
+  integrity sha512-03eXong5NLnNCD05xscnGKGDZ98CyzoqPSMjOe6SuoQY7Z2hIj0Ld1g/O/UQRuOle2aRtiIRDg9tDcTGAkLfKw==
+  dependencies:
+    chalk "^2.4.2"
+    source-map "^0.6.1"
+    supports-color "^6.1.0"
+
 prelude-ls@^1.2.1:
   version "1.2.1"
   resolved "https://registry.yarnpkg.com/prelude-ls/-/prelude-ls-1.2.1.tgz#debc6489d7a6e6b0e7611888cec880337d316396"