Add plugins and update paths.

.gitmodules

@@ -1,3 +1,9 @@
 [submodule ".oh-my-zsh"]
 	path = .oh-my-zsh
 	url = https://github.com/robbyrussell/oh-my-zsh.git
+[submodule "zsh-custom/plugins/zsh-autosuggestions"]
+	path = zsh-custom/plugins/zsh-autosuggestions
+	url = git://github.com/zsh-users/zsh-autosuggestions
+[submodule "zsh-custom/plugins/zsh-syntax-highlighting"]
+	path = zsh-custom/plugins/zsh-syntax-highlighting
+	url = git://github.com/zsh-users/zsh-syntax-highlighting