fix wrong syntax in Usage

PeterDaveHello · PeterDaveHello · commit 0a166f47f648 · 2015-06-10T01:20:19.000+08:00
diff --git a/README.md b/README.md
@@ -9,7 +9,7 @@ Make echo colorful with easier method. In [bash](https://www.gnu.org/software/ba
 
 ## Usage
 
-* echo.`Style`.`Color`
+* echo.`Style``Color`
 
 ### Examples
 
