Fix #48, remove CHANGELOG.md

Fixes #48 

As discussed in various `laminas/` projects, since the introduction of `laminas/automatic-releases`, `CHANGELOG.md` is superseded by:

 * git history
 * release notes

The `CHANGELOG.md` that we currently have is unnecessary, and also used CRLF, which causes issues for `drupal/` users downstream.

Dropping it is the simplest solution to that problem

Author: Ocramius