v0.9.1

What's Changed

• add the list of competitions sahi made us win by @fcakyon in #385
• add citation to paper by @fcakyon in #387
• add arxiv url for the SAHI paper by @fcakyon in #388
• handle invalid mask prediction by @fcakyon in #390
• improve code quality by @fcakyon in #398
• improve nms postprocess by @tureckova in #405

Full Changelog: 0.9.0...0.9.1