Upgrade CLI

When a new Ritchie CLI version is released, a warning will appear when executing one of the following commands:

- rit(helper) - rit -v (version)

To upgrade the Ritchie CLI version when this warning appears, run the following command:

rit upgrade

Example of the command output for the 2.6.0 version

➜ rit upgrade
Rit upgraded with success
Release 2.6.0 description:
* Added multiselect input for formulas
* User is notified when adding the same repo and version
* Release notes are displayed on every upgrade
* Rit add repo will only add valid repos
* Context commands substituted by env commands
* Deprecated stdin

This output is based on the description of the release tag on the ritchie-cli releases page on Github.