- **BREAKING CHANGES: `read_mtd()` returns a dict for the namespace map in order to manage multi namespace XMLs**
- **ENH: Introduced support for DEM files from web urls (starting with http(s)://)**
- FIX: Landsat Zenith angle computation (mixing elevation and zenith angle)
- CI: Adding weekly tests (`tox` on Python 3.7, 3.8, 3.9 on Linux and Windows)
- DOC: Updating documentation, setting DEM path as an environment variable