0.0.3

Fix an issue where auto changing Xcode didn't work for ZSH users.

- Cache Xcodes in `XCODES` environment variable when `chxcode` is fir…

…st sourced. This is more more performant It also makes it possible for users to manually add Xcodes that `chxcode` can't find because Spotlight is disabled.

- Show asterisk in front of currently selected Xcode when listing Xcode versions.

- The `APPLICATIONS` variable. This is an implementation detail and shouldn't leak into a user's shell.

- Xcodes are found using `mdfind` instead of globs.
- Xcode version numbers are determined using `mdls` instead of the name of the app bundle.

First Release