Please consider loosening dependency requirements

Hello,

in `requirements.txt` there are lots of dependencies whose versions are fixed, this is causing trouble when pip tries to resolve dependency issues. Often times evalai cli runs without problem but other programs that run under the same env would crash. Would you consider using `>=`/`<=` instead of '==`? Thank you.

Start with requirements.txt and review the pinned dependency versions and their compatibility constraints. Check whether loosening the constraints allows pip to resolve the CLI environment while preserving a successful installation; done means the dependency requirements are updated without breaking installation.

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