0.3.0-rc3

What's Changed

• add bench by @doubleailes in #30
• add gif by @doubleailes in #32
• 35 add a real sample to test many files by @doubleailes in #36
• 37 try to implement threading pool by @doubleailes in #38

Full Changelog: 0.2.0...0.3.0-rc3