1.3.10 Minor bug fixes

What's Changed

• Fixed version check by actually writing a test for it. by @dccote in #453
• Better warnings by @dccote in #458
• Gaussian rays by @dccote in #459
• Fixed display bug by @dccote in #457
• Minor fix to keep python 3.6 support by @JLBegin in #463

Full Changelog: 1.3.9...1.3.10