chore(deps): update dependency github-markdown-css to v3 (#266)

Author: renovate[bot]

package.json

@@ -61,7 +61,7 @@
     "fs-extra": "7.0.1",
     "fuzzy": "0.1.3",
     "gh-pages": "2.0.1",
-    "github-markdown-css": "2.10.0",
+    "github-markdown-css": "3.0.1",
     "handlebars": "4.0.12",
     "handlebars-helpers": "0.10.0",
     "html-loader": "0.5.5",

yarn.lock

@@ -5953,10 +5953,10 @@ gitconfiglocal@^1.0.0:
   dependencies:
     ini "^1.3.2"
 
-github-markdown-css@2.10.0:
-  version "2.10.0"
-  resolved "https://registry.yarnpkg.com/github-markdown-css/-/github-markdown-css-2.10.0.tgz#0612fed22816b33b282f37ef8def7a4ecabfe993"
-  integrity sha512-RX5VUC54uX6Lvrm226M9kMzsNeOa81MnKyxb3J0G5KLjyoOySOZgwyKFkUpv6iUhooiUZdogk+OTwQPJ4WttYg==
+github-markdown-css@3.0.1:
+  version "3.0.1"
+  resolved "https://registry.yarnpkg.com/github-markdown-css/-/github-markdown-css-3.0.1.tgz#d08db1060d2e182025e0d07d547cfe2afed30205"
+  integrity sha512-9G5CIPsHoyk5ObDsb/H4KTi23J8KE1oDd4KYU51qwqeM+lKWAiO7abpSgCkyWswgmSKBiuE7/4f8xUz7f2qAiQ==
 
 github-slugger@^1.2.0:
   version "1.2.0"