pytest-cov==2.6.1, contributing: '--last-failed' and '--no-cov' tips

Angelos Evripiotisrequested to merge
aevri/tox_no_cov into master

Description

Changes proposed in this merge request:

  • Bump pytest-cov to 2.6.1 to fix a bug with --no-cov.
  • Add a tip to contributing.rst about --no-cov.
  • Add a tip to contributing.rst about --last-failed and friends.

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