Add 0.1.0 version of notebook 06_applicatives for fp course

fix(CHANGELOG): reverse the order of CHANGELOG

refactor(fp): v0.1.1 of notebook 05_functors.py

Fixing typo

Improve notebook and README as suggested by Haleshot

Update README and CHANGELOG

Add notebook 05_functors (version 0.1.0) for the functional programming course

Add CHANGELOG

Remove duplicate implementations in markdown

Demo version of 05_functors.py