Merge pull request #67 from tookayNET/fix/helprequest

fix(tutor.model): fix avg_rating type to float

Merge pull request #65 from tookayNET/feat/endchatsession

feat(events): add end session listener and chat closed event emitter

Merge pull request #63 from tookayNET/fix/messagestore

fix(message-store): fix issue iterating over an undefined priorMessages array

Merge pull request #61 from tookayNET/feat/helprequest

fix(helprequest): fix logic in helprequest update, rename attribute, fix doc

Merge pull request #60 from tookayNET/docs/readme

docs(readme): update changelog in readme

Merge pull request #58 from tookayNET/feat/apilogic

fix(helprequest.controller): fix tutor average rating calculation

fix(student): move variables outside of dir push check

fix(helprequest): fix bug in counting completed help requests and allow rating 0

feat(helprequest): add interested and blocked_tutors to help request