More bug fixes

Fixed an error due to wrong variable name in the MT5 trimmer.

v3.0.0 Major bug fixes

NOTE: This update is non-compatible with older code, and requires you to change your import statements.

Changelog:

1. Fixed variable name (issue #1) for MBart and BaseTrimmer
2. Fixed example code in the README.md
3. Fixed issues with setup
4. Refactored code to have a more consistent naming scheme