Bump material-ui-popup-state from 1.3.2 to 1.4.0

[dependabot-preview]

Bumps material-ui-popup-state from 1.3.2 to 1.4.0.

Release notes

Sourced from material-ui-popup-state's releases.

v1.4.0

1.4.0 (2019-06-07)

Bug Fixes

• cascading hover menus with material-ui v4 (3c28251), closes #9

Features

• add anchorRef API for complex use cases (5f65eb4)

Commits

• 1fbbe9d Merge pull request #10 from jcoreio/mui-v4
• 3c28251 fix: cascading hover menus with material-ui v4
• 2a68338 docs(demo): fix menu position [ci skip]
• 5f65eb4 feat: add anchorRef API for complex use cases
• 635a2c2 ci: remove private NPM token handling andd exclude gh-pages branch
• See full diff in compare view

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