Add Arch linux install notes

TylerBrock · TylerBrock · commit 37ab581f1665 · 2018-06-09T20:57:06.000-07:00
diff --git a/README.md b/README.md
@@ -13,6 +13,14 @@ brew tap TylerBrock/saw
 brew install saw
 ```
 
+### Linux (Arch Linux)
+
+```sh
+pacaur -S saw
+# OR
+trizen -S saw
+```
+
 ### Linux (binary)
 
 #### Redhat Based Distributions (Fedora/RHEL/CentOS/Amazon Linux)
