v1.5.1
Changed attribution control default link to HTTPS (#6593)
Control.Layers: add stamp id to the radio button name, to make it unique per control. (#6483)
upgrade deps, fix indenting (#5743)
docstrings for the zoomControl map property (#6254)
Explicitly remove controls from the map on map unload (#6488)
ES2015 modules: Add index.js files to subdirectories/namespace (#5329)