leaflet.providers 1.9.0

• Updated leaflet.providers data on 2019-11-06 from https://unpkg.com/leaflet-providers using version 1.9.0 of leaflet.js

# leaflet.providers 1.8.0

• Added a NEWS.md file to track changes to the package.
• Initialized package (version number 1.8.0 matches version number of leaflet-providers.js).