Updated README.md to fix #230

Thanks @p5k6!
diff --git a/README.md b/README.md
index 105d5be..527034c 100644
--- a/README.md
+++ b/README.md
@@ -8,7 +8,7 @@
 
 ## Install
 
-1. Check a clone of this repo: `git clone http://github.com/revans/bash-it.git ~/.bash_it`
+1. Check a clone of this repo: `git clone https://github.com/revans/bash-it.git ~/.bash_it`
 2. Run `~/.bash_it/install.sh` (it automatically backs up your `~/.bash_profile`)
 3. Edit your `~/.bash_profile` file in order to customize bash-it.