Version 1.3.8

Minor changes

• Add argument service to s2_list() and s2_download() for using "dhus" API service instead of default "apihub" (this could be useful in case of apihub downtimes).
• Add experimental argument kill_errored to sen2cor() (see documentation).
• Add argument server to s2_list() to be used for future implementations.
• Replace internal URLs https://raw.githubusercontet.com/x/y with https://github.com/x/y/raw.

Changes in default values

• build_example_param_file() now generates more recent images, 2020-08-01 instead than 2019-07-23 (this because the previous ones required two SAFE which are now on LTA); the same was done for some tests.

Bug fixes

• Fix #338