#356 Fix talisman installation on M1 architectures

Add check for M1 architecture machines.
It is currently reported as `arm64` by `uname -m` on Apple Silicon.

Author: svishwanath-tw

install.sh

@@ -103,9 +103,12 @@ run() {
 		"i686" | "i386")
 			OS="${OS}_386"
 			;;
+    		"arm64")
+			OS="${OS}_arm64"
+			;;
 		*)
 			echo_error "Talisman currently only supports x86 and x86_64 architectures."
-			echo_error "If this is a problem for you, please open an issue: https://github.com/${INSTALL_ORG_REPO}/issues/new"
+			echo_error "If this is a problem for you, please open an issue: https://github.com/thoughtworks/talisman/issues/new"
 			exit $E_UNSUPPORTED_ARCH
 			;;
 		esac