[readme] Update source command to include s in zsh

README.md

diff --git a/README.md b/README.md
index d71fa94..b60a8c2 100644
--- a/README.md
+++ b/README.md
@@ -96,7 +96,7 @@
 
 *bash*: `source ~/.bashrc`
 
-*zsh*: `source ~/.zhrc`
+*zsh*: `source ~/.zshrc`
 
 *ksh*: `. ~/.profile`