update Installation in readme

Author: PeterDaveHello

README.md

@@ -3,7 +3,9 @@ Make echo colorful with easier method. In [bash](https://www.gnu.org/software/ba
 
 ## Installation
 
-* Download the script and add one line to your shell rc: `. colorEcho.sh` or run `. colorEcho.sh` directly.
+* Download the script [dist/colorEcho.sh](https://cdn.rawgit.com/PeterDaveHello/ColorEchoForShell/master/dist/colorEcho.sh)
+* Add this line to your shell rc or run it directly:
+`. colorEcho.sh`
 
 ## Usage