fix deploy

Author: BurntSushi

ci/before_deploy.sh

@@ -18,7 +18,7 @@ mk_tarball() {
     mkdir "$td/$name"
 
     cp target/$TARGET/release/rg "$td/$name/"
-    cp {README,UNLICENSE,COPYING,LICENSE_MIT} "$td/$name/"
+    cp {README.md,UNLICENSE,COPYING,LICENSE-MIT} "$td/$name/"
 
     pushd $td
     tar czf "$out_dir/$name.tar.gz" *