Merge branch 'release/0.0.72' into develop
src: fix a mistake
src: add instance method 'bottomRightCorner()'
test: add instance method 'bottomRightCorner()' testings
readme: add instance method 'bottomRightCorner()' api
lint: add some files for linting pass
npm: 0.0.72 -> 0.0.73
readme: update instance method 'bottomRightCorner()' api
Merge branch 'release/0.0.73'