Not backward compatible for 4.6 tree

[PatelUtkarsh]

Tested on a fresh install of 4.6.1 with master branch and it is throwing error.

Error: Uncaught TypeError: Cannot read property 'get'
changesetStatus = api.state( 'changesetStatus' ).get();

wp-customizer-browser-history/customizer-browser-history-controls.js

Line 134 in ce6502b

changesetStatus = api.state( 'changesetStatus' ).get();

As changeset was introduced in 4.7.
This plugin should be backward compatible or we should change tag Requires at least to 4.7.

[westonruter]

@PatelUtkarsh you're right! How does #18 work for you?