Vfb-connect

What's Changed
* only supports major version by Robbie1977 in https://github.com/VirtualFlyBrain/VFB_connect/pull/172


**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.20...v2.1.22

Fix for read the docs builds

**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.20...v2.1.21

What's Changed
* Predicted NTs by Clare72 in https://github.com/VirtualFlyBrain/VFB_connect/pull/166
* template default fix by Robbie1977 in https://github.com/VirtualFlyBrain/VFB_connect/pull/167


**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.19...v2.1.20

What's Changed
* Fix for NoneType issue in python 3.9 by Robbie1977 in https://github.com/VirtualFlyBrain/VFB_connect/pull/163


**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.18...v2.1.19

What's Changed
* General bug fixes and dependency version resolving by Robbie1977 in https://github.com/VirtualFlyBrain/VFB_connect/pull/161
* Added vfb.get_nt_receptors_in_downstream_neurons

**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.17...v2.1.18

What's Changed
* Dependancy fixes and global load limit by Robbie1977 in https://github.com/VirtualFlyBrain/VFB_connect/pull/159


**Full Changelog**: https://github.com/VirtualFlyBrain/VFB_connect/compare/v2.1.16...v2.1.17