Fix spelling mistake in README

Author: eRaz00r

README.md

@@ -6,7 +6,7 @@
 
 - You don't need to touch the command line
 - You don't need to install/configure ruby, rvm/rbenv, ruby gems :relaxed:
-- You don't need to install runtime dependancies like markdown processors, Pygments, etc
+- You don't need to install runtime dependencies like markdown processors, Pygments, etc
 - If you're on Windows, this will make setting up Jekyll a lot easier
 - It's easy to try out, you can just delete your forked repository if you don't like it