Update github-markdown.css

CmcnPro · web-flow · commit 8fcc66e66995 · 2016-09-26T16:32:57.000+08:00
Add "Microsoft YaHei Mono",
diff --git a/github-markdown.css b/github-markdown.css
@@ -8,7 +8,7 @@
   -webkit-text-size-adjust: 100%;
   line-height: 1.5;
   color: #333;
-  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
+  font-family: "Microsoft YaHei Mono",-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
   font-size: 16px;
   line-height: 1.5;
   word-wrap: break-word;
