v2.1.0

Removed

• removed Changelog.md in favor of GitHub releases (#3)

Added

• ensure everything works under set -u (#22)
• add assert_not_equal (#37)
• allow negative indices for specifying line assertions from the back (#30)
• add assert_regex/refute_regex (#43, #44)

Changed

• extract assertions to separate files (#19)
• improve in-source documentation (#25)
• improve README.md, point to bats-core instead of old sources (#26, #36, #39, #45)
• migrate tests to GitHub Actions (#41)
• use bats_load_library bats-support in test helper (#49)