neat 0.5.1 (hotfix)

fixes a bug with the activation registry not properly filtering activation functions

What's Changed

• change cfg macros to remove redundancy by @inflectrix in #40
• update example with new changes by @inflectrix in #43
• Urgent hotfix by @inflectrix in #44
• change version by @inflectrix in #45
• hotfix by @inflectrix in #46

Full Changelog: v0.5.0...v0.5.1