fix: filter demos folder

chore: update package version

Merge pull request antvis#689 from antvis/daily-190419

feat(util): add util to measure text position with refX, refY & rotate

chore(package): update package version

fix(item): fix item source and target

feat(graph): add read

chore(package): update package version

chore(package): update package version

chore: update package version

Merge pull request antvis#638 from antvis/daily-190306

Daily 190306