fixed rubocop#66 - string interpolation suggestion

bbatsov · bbatsov · commit 86ceddaddeb7 · 2012-04-21T12:33:07.000+03:00
diff --git a/README.md b/README.md
@@ -1125,6 +1125,13 @@ syntax.
     email_with_name = "#{user.name} <#{user.email}>"
     ```
 
+* Consider padding string interpolation code with space. It more clearly sets the
+  code apart from the string.
+
+    ```Ruby
+    "#{ user.last_name }, #{ user.first_name }"
+    ```
+
 * Prefer single-quoted strings when you don't need string interpolation or
   special symbols such as `\t`, `\n`, `'`, etc.
 
