Increase line-height for headings

Author: sapegin

styles/markdown.scss

@@ -17,7 +17,7 @@
   h1, h2, h3, h4, h5, h6 {
     font-family: $font-stack-heading;
     font-weight:600;
-    line-height:1;
+    line-height:1.4;
     margin:1.5em 0 0.25em;
     color:getColor(fiord);