Update README.rst
Add instructions to install on Arch Linux through AUR.
@@ -56,7 +56,16 @@ To install RGBDS with all of the current changes in development (as seen on the
brew install rgbds --HEAD
-1.3 Other UNIX-like systems
+1.3 Arch Linux
+~~~~~~~~~~~~~~
+
+To install RGBDS through the AUR run
+
+.. code:: sh
+
+ yaourt -S rgbds
+
+1.4 Other UNIX-like systems
~~~~~~~~~~~~~~~~~~~~~~~~~~~
No official binaries of RGBDS are distributed for these systems, you must follow
