Use Makefile instead of installer.sh

Makefile

@@ -0,0 +1,11 @@
+PREFIX=/usr/local
+
+install:
+	@printf "Installing to ${DESTDIR}${PREFIX}/bin...\n"
+	install -Dm755 cmus-notify.pl ${DESTDIR}${PREFIX}/bin/cmus-notify
+	@printf "Installed!\n"
+
+uninstall:
+	rm ${PREFIX}/bin/cmus-notify
+	@printf "Removed ${PREFIX}/bin/cmus-notify.\n"
+	@printf "Configuration and cache files may still be present in cmus configuration directory."

README.md

@@ -16,10 +16,10 @@ A cmus status notification program made for easy configuration and portability.
 
 * `git clone https://github.com/dcx86r/cmus-notify`  
 * install `HTML::Entities` module from CPAN
-* `[sudo] sh installer.sh install`
+* `[sudo] make install`
 
 ...and to uninstall:  
-* `[sudo] sh installer.sh uninstall`
+* `[sudo] make uninstall`
 
 If using a previous version, uninstall old version before installing new one