v1.4.0
ES6 modules & Rollup (#4989)
Fix/different element for layer switcher (#6380)
upgrade deps, fix indenting (#5743)
docstrings for the zoomControl map property (#6254)
Scrubbing of detached DOM elements, prevents memory leaks (#5265)
ES2015 modules: Add index.js files to subdirectories/namespace (#5329)