4.15.0

✨ New Features

• 4a20cf8 - reduce 4.15 (commit by @kiyoon)

♻️ Refactors

• e42a13c - use biotest (commit by @kiyoon)

✅ Tests

• 4a15082 - add popen_reduce (commit by @kiyoon)
• 8a3fb24 - fix wrong test (commit by @kiyoon)
• f891581 - fix wrong test (commit by @kiyoon)
• c3172fc - add test and codecov for every commit (prev. only when deploy) (commit by @kiyoon)
• d83cf90 - fix for reduce 4.15 (commit by @kiyoon)