Fixes package name error

This update introduces the new ISOLATE feature coming from Laravel Valet 3.

To use it, just type valet isolate [version] inside a valet configured folder !
if the version's php-fpm is not yet installed, it will be installed automatically (tested on ubuntu).

to revert to default version, use valet unisolate.

PS : at the moment, valet isolate and valet secure are not compatible. If you run secure after isolate, only the secure option is applied.

Should have seen it earlier, but....

The version has been bumped in valet.php so the update should be consistent !

Fix the release missing the "v" prepend !