Add rr.

Author: fredrikekre

Makefile

@@ -51,3 +51,4 @@ $(eval $(call simple-install,ghr,ghr_jll,ghr))
 $(eval $(call simple-install,fzf,fzf_jll,fzf))
 $(eval $(call simple-install,git-crypt,git_crypt_jll,git_crypt))
 $(eval $(call simple-install,git,Git_jll,git))
+$(eval $(call simple-install,rr,rr_jll,rr))