update readme

PeterDaveHello · Jun 8, 2015 · a2a90c3 · a2a90c3
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 # ColorEchoForShell
-Make echo colorful with easier method.
+Make echo colorful with easier method. In [bash](https://www.gnu.org/software/bash/) and [zsh](http://www.zsh.org/).
 
 ## Installation