Font-weight changed to 400 (standart)

https://github.com/eddiemachado/bones/issues/303

library/less/_base.less

@@ -126,7 +126,7 @@ a, a:visited {
 h1, .h1, h2, .h2, h3, .h3, h4, .h4, h5, .h5 {
 	font-family: @sans-serif;
 	text-rendering: optimizelegibility;
-	font-weight: 500;
+	font-weight: 400;
 	/*
 	if you're going to use webfonts, be sure to check your weights
 	http://css-tricks.com/watch-your-font-weight/