Update README.md

Fix typo.

Author: PeterDaveHello

README.md

@@ -16,7 +16,7 @@ Make echo colorful with easier method. In [bash](https://www.gnu.org/software/ba
 
 ## Installation
 
-* Download the script, choice the once for your shell by its extension in the filename.
+* Download the script, choice the one for your shell by its extension in the filename.
 - For example [dist/ColorEcho.bash](https://cdn.rawgit.com/PeterDaveHello/ColorEchoForShell/v0.0.4/dist/ColorEcho.bash) for bash.
 * Add a line to include the script in your shell rc or run it directly:
 `. ./ColorEcho.bash`