Custom pathFunc

[Emsu]

Besides elbow, diagonal, and straight, would be great to pass a custom func. My use case is an elbow like func with 4 segments instead of 2.

Looks like we can just add function as an acceptable propType in the enum and call the function if a function is given otherwise check for 'straight', 'diagonal', and 'elbow' as is currently done.

• Implementation
• Unit test
• Docs

[bkrem]

Hey @Emsu,

Finally released this in v1.5.1, so I'll be closing the issue.

Thank you for your contribution and keen to see what can be done about #36! :)