Export PathFinding from react-diagrams-routing

[vadimshvetsov]

Checklist

• [x] The code has been run through pretty yarn run pretty
• [x] The tests pass on CircleCI
• [x] You have referenced the issue(s) or other PR(s) this fixes/relates-to
• [x] The PR Template has been filled out (see below)
• [x] Had a beer/coffee because you are awesome

What?

Closes #336 Reexport PathFinding because it's unreachable right now

Why?

It should be reachable for extending

How?

With reexporting default from react-diagrams-routing

Feel good image:

[vadimshvetsov]

Close because it's exported properly in 6.5.1