ADD clever load path
ADD clever load path

When using `gem_update` locally, it falls back to requiring official
rubygems version, which is quite painful for local dev.
The best would be for it to use the version from where it is called,
which is handled by updating load path.

Details
* ADD a clever load path

oelmekki/gem_updater,MaximeD/gem_updater,MaximeD/gem_updater,oelmekki/gem_updater