Enhance the version function further and increase accessibility to the CHANGELOG

[yorkshire-pudding]

Enhance version
Since the last commit, I have started adding the latest update date after the [Unreleased] heading in the CHANGELOG. I will extract this date for the version command where users are running the dev branch and this will enable to pin down further what version of bee is being used in the event of a bug report.

Increase accessibility to the CHANGELOG
The file CHANGELOG.md is in the top level of the repo but unless someone knows it is there, they won't find it. Also, for some installations the programme folder may not be easily accessible. Currently for phar users, this isn't included, but even if it was it wouldn't be readable.
Therefore, I propose to:

• Add a simple command to view the CHANGELOG. This will output as is with no special handling.
• Add the CHANGELOG.md file to the box.json specification for phar files.