v1.15.0

Changelog

• 9e91a03 Update CI (#466)
• 9199872 fix erroneous docstring of sh.Exec() (#452)
• 02bde0b Update jQuery to 3.5.0 (#458)
• 1b8774a -d dir contains magefiles stop with "No .go files marked with the mage build tag..." (#447) (#448)
• a920604 mage: cancel context on SIGINT (#313)