Use correct git URL for installation

The URL wasn't updated during repository migration from a personal account
to the Bees Hive organization. As I still have a fork, installation works,
but it installs the obsolete version.

Now, the installation will use the correct git  repository and always use
the latest version of Elegant Git.

is not always up to date.

install.bash

@@ -5,7 +5,7 @@
 #   ./install.bash /installation/path src    installs to "installation/path" from local sources
 set -e
 
-REPO_HOME="https://github.com/extsoft/elegant-git.git"
+REPO_HOME="https://github.com/bees-hive/elegant-git.git"
 
 copy(){
     local FROM=${1}