Update style-loader to the latest version 🚀 (#861)

## The dependency [style-loader](https://github.com/webpack-contrib/style-loader) was updated from `0.23.0` to `0.23.1`.
This version is **not covered** by your **current version range**.

If you don’t accept this pull request, your project will work just like it did before. However, you might be missing out on a bunch of new features, fixes and/or performance improvements from the dependency update.

---

[Find out more about this release](https://github.com/webpack-contrib/style-loader).

<details>
  <summary>FAQ and help</summary>

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Author: greenkeeper[bot]

package.json

@@ -80,7 +80,7 @@
     "shuffle-array": "^1.0.1",
     "soundmanager2": "^2.97.20170602",
     "source-map-loader": "^0.2.3",
-    "style-loader": "0.23.0",
+    "style-loader": "0.23.1",
     "substitute-loader": "^1.0.0",
     "trianglify": "^1.1.0",
     "ts-node": "^7.0.1",

yarn.lock

@@ -674,6 +674,10 @@ add-dom-event-listener@1.x:
   dependencies:
     object-assign "4.x"
 
+ajv-errors@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/ajv-errors/-/ajv-errors-1.0.0.tgz#ecf021fa108fd17dfb5e6b383f2dd233e31ffc59"
+
 ajv-keywords@^3.0.0, ajv-keywords@^3.1.0:
   version "3.2.0"
   resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-3.2.0.tgz#e86b819c602cf8821ad637413698f1dec021847a"
@@ -9530,6 +9534,14 @@ schema-utils@^0.4.3, schema-utils@^0.4.4, schema-utils@^0.4.5:
     ajv "^6.1.0"
     ajv-keywords "^3.1.0"
 
+schema-utils@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/schema-utils/-/schema-utils-1.0.0.tgz#0b79a93204d7b600d4b2850d1f66c2a34951c770"
+  dependencies:
+    ajv "^6.1.0"
+    ajv-errors "^1.0.0"
+    ajv-keywords "^3.1.0"
+
 screenfull@^3.3.1:
   version "3.3.2"
   resolved "https://registry.yarnpkg.com/screenfull/-/screenfull-3.3.2.tgz#a6adf3b3f5556da812725385880600f5b39fbf25"
@@ -10197,12 +10209,12 @@ strip-url-auth@^1.0.0:
   version "1.0.1"
   resolved "https://registry.yarnpkg.com/strip-url-auth/-/strip-url-auth-1.0.1.tgz#22b0fa3a41385b33be3f331551bbb837fa0cd7ae"
 
-style-loader@0.23.0:
-  version "0.23.0"
-  resolved "https://registry.yarnpkg.com/style-loader/-/style-loader-0.23.0.tgz#8377fefab68416a2e05f1cabd8c3a3acfcce74f1"
+style-loader@0.23.1:
+  version "0.23.1"
+  resolved "https://registry.yarnpkg.com/style-loader/-/style-loader-0.23.1.tgz#cb9154606f3e771ab6c4ab637026a1049174d925"
   dependencies:
     loader-utils "^1.1.0"
-    schema-utils "^0.4.5"
+    schema-utils "^1.0.0"
 
 substitute-loader@^1.0.0:
   version "1.0.0"