Update README.md

Author: fernandodelrio

README.md

@@ -2,7 +2,7 @@
 Repo for my GalleryApp, made with Swift, Combine and Buck
 
 ```
-$ make build debug - Build and install in a simulator
+$ make debug - Build and install in a simulator
 $ make project open - Generate project and open (make sure to attach Xcode to a previously built app)
 $ make test - Run tests
 $ make server - Create a server to save/restore the build cache (Make sure to edit .buckconfig)