Release v2.2.1 · vaadin/vaadin-checkbox

c979be0 Update vaadin-element-mixin to 2.0.0
83d6467 Remove Polymer legacy syntax from demo [skip ci]
7ac8e03 Update test to check the first button checked state
8fb62d5 Move adding of the listeners to ready
68a6bed Add test for checking number of calls of checked changed listener
06bfeeb Run tests in headless Chrome and Firefox, use sudo: false in travis
d990500 Remove analysis.json [skip ci]
642739a Exclude visual tests for PR builds in travis [skip ci]
05607fa Remove Polymer mention [skip ci]
cc9ec44 Use badgen for npm and bower versions badges [skip ci]
c1549b0 Add Part name to the description
d38dd37 Switch from using flattenedNodesObserver to use slotchange event
d8a4d3c Update test to dispatch slotchange event instead of flushing observer
335081e Add emtpy attribute documentation, update existing state attributes docs
2fee129 Update styles for non-empty label in material and lumo
50ea00b Add observer for tracking removal/adding of the label
7e20415 Add tests for setting empty attribute on part label
38a7b57 Update screenshots to include empty label
ff08af0 Add visual test
7bae657 Use @vaadin/vaadin-component-dev-dependencies

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