Update README.md

Improve Markdown indentation

README.md

@@ -56,14 +56,14 @@ We are hoping to collect a bunch of themes for our command prompts. You can see
 ### Manual installation
 
 1. Clone the repository
-       ```fish
-git clone git://github.com/bpinto/oh-my-fish.git ~/.oh-my-fish
-```
+   ```fish
+   git clone git://github.com/bpinto/oh-my-fish.git ~/.oh-my-fish
+   ```
 
 2. Create a new fish config by copying the fish template we've provided.
-       ```fish
-cp ~/.oh-my-fish/templates/config.fish ~/.config/fish/config.fish
-```
+   ```fish
+   cp ~/.oh-my-fish/templates/config.fish ~/.config/fish/config.fish
+   ```
 
 3. Start / restart fish (just open a new terminal)