Remove duplicated semicolon in base.css

Author: zousandian

public/css/base.css

@@ -1,6 +1,6 @@
 body {
   background: #fff;
-  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;;
+  font-family: "Helvetica Neue", Helvetica, Arial, sans-serif;
   font-size: 15px;
   line-height: 1.7;
   margin: 0;