Concatenation examples are now equivalent

Author: bmorrall

README.md

@@ -208,7 +208,7 @@
 
     // good
     var errorMessage = 'This is a super long error that ' +
-      'was thrown because of Batman.' +
+      'was thrown because of Batman. ' +
       'When you stop to think about ' +
       'how Batman had anything to do ' +
       'with this, you would get nowhere ' +