Update README.md
Fix: jshint error
Merge pull request #24 from CyberAgent/fix-jshint-error

Fix: jshint error
Merge pull request #23 from amanattou44/update-readme

Update README.md
release: 1.0.20
Fix: children of the model are not dispose
Merge pull request #25 from CyberAgent/fix-model-dispose

Fix: children of the model are not dispose
release: 1.0.21