readme: Fix formatting

README.md

@@ -26,7 +26,7 @@ brew install https://raw.githubusercontent.com/ryan-robeson/homebrew-gimp/master
 
 1. `brew install --build-bottle $formula`
 2. Edit './prep-bottles'
-  * Adjust the 'root\_url' and 'formula' variables as necessary. (Yes, this needs more automation)
+    * Adjust the 'root\_url' and 'formula' variables as necessary. (Yes, this needs more automation)
 3. `./prep-bottles`
-  * This script currently assumes Sierra as the build platform.
+    * This script currently assumes Sierra as the build platform.
 4. Bottles have been built and the formula has been updated.