[MRG] Release 0.8

[rflamary]

Types of changes

• Docs change / refactoring / dependency upgrade
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Motivation and context / Related issue

How has this been tested (if it applies)

Checklist

• The documentation is up-to-date with the changes I made.
• I have read the CONTRIBUTING document.
• All tests passed, and additional code has been covered with new tests.

[codecov]

Codecov Report

Merging #289 (783cffe) into master (0eac835) will not change coverage.
The diff coverage is 100.00%.

❗ Current head 783cffe differs from pull request most recent head f1422f9. Consider uploading reports for the commit f1422f9 to get more accurate results

@@           Coverage Diff           @@
##           master     #289   +/-   ##
=======================================
  Coverage   93.38%   93.38%           
=======================================
  Files          21       21           
  Lines        4886     4886           
=======================================
  Hits         4563     4563           
  Misses        323      323