v1.8.1.0

This is the first release bumping the version number this way.

What's Changed

• Bump version to NativeRL 1.8.1 by @slinlee in #427
• Release Reward terms to Prod by @slinlee in #430
• Revert "Merge pull request #430 from SkymindIO/staging" by @slinlee in #432
• Revert "Merge pull request #432 from SkymindIO/sl/rollbackprod172" by @slinlee in #435
• python 3.7 compat by @maxpumperla in #438
• Update model analyzer build readme by @slinlee in #440
• Add auto-tests and code linting checks for PR by @slinlee in #439
• Re-add createEnvironment from pynativerl by @slinlee in #447
• Fix lint errors in factory sim by @slinlee in #448
• Add description of usage to Readme by @slinlee in #449
• Fix undefined metrics bug #441 by @slinlee in #451
• Weekly update for staging by @slinlee in #452
• Hotfix - Sort base dependencies in reverse order (#456) by @slinlee in #465
• HOTFIX - Remove reverse sorting for libraries by @slinlee in #476

Full Changelog: v1.8.0...v1.8.1.0