Use 80 chars for consistency with comment above

Author: Dan Caddigan

README.md

@@ -199,21 +199,15 @@
     var errorMessage = 'This is a super long error that was thrown because of Batman. When you stop to think about how Batman had anything to do with this, you would get nowhere fast.';
 
     // bad
-    var errorMessage = 'This is a super long error that \
-    was thrown because of Batman. \
-    When you stop to think about \
-    how Batman had anything to do \
+    var errorMessage = 'This is a super long error that was thrown because \
+    of Batman. When you stop to think about how Batman had anything to do \
     with this, you would get nowhere \
     fast.';
 
-
     // good
-    var errorMessage = 'This is a super long error that ' +
-      'was thrown because of Batman. ' +
-      'When you stop to think about ' +
-      'how Batman had anything to do ' +
-      'with this, you would get nowhere ' +
-      'fast.';
+    var errorMessage = 'This is a super long error that was thrown because ' +
+      'of Batman. When you stop to think about how Batman had anything to do ' +
+      'with this, you would get nowhere fast.';
     ```
 
   - When programatically building up a string, use Array#join instead of string concatenation. Mostly for IE: [jsPerf](http://jsperf.com/string-vs-array-concat/2).