hotfix pubspec.yaml

fixes formatting and adds changelog

updates version and changelog

updates readme version

v0.6.2: Resolves memory overflow issues

v0.6.1: Adds dispose function to AR session

Merge pull request #52 from sclassen/fixWorldOriginColor

fix color of world origin node

v5.0.1: removes overly restrictive background location permission on …

…Android

v0.5.0: local file system assets, screenshots, and package updates

v0.5.0: local file system assets, screenshots, and package updates

v0.4.3: Updates documentation after publishing to pub.dev

v0.4.3: Updates documentation after publishing to pub.dev