Streamline change history in ReadMe

[astrogeco]

Is your feature request related to a problem? Please describe.
The changelog history clutters the ReadMe.

Describe the solution you'd like
Move all change history to a new CHANGELOG.md. Replace "History" section on ReadMe with a "Changes in Latest Build" section that contains the latest entry in the changelog.

Describe alternatives you've considered
Automatically generating the changelog. Stop including the change summary in the ReadMe.

Additional context
None

[skliper]

Recommending just a high level summary in the ReadMe (major changes in current and previous development cycles, a couple lines per release/cycle) as more valuable than the latest changelog entry. Only needs to be updated when major changes happen. Just reference the CHANGELOG for details.