Update beautiful dnd example

[tim-mccurrach]

Fix React beautiful dnd example

Thanks, for the library :) I've very much enjoyed using final-forms. The current example with react-beautiful-dnd here uses the following for makeOnDragEndFunction drop:

fields.swap(result.source.index, result.destination.index);

This has the effect, that if you start off with #1, #2, #3, #4 and you move #4 to the second position, then after the drop, #2 jumps to the end position, which is unexpected. I have forked the example on sandbox, and updated this line to become:

fields.move(result.source.index, result.destination.index);

and also updated the link in the readme to the new sandbox.

[codecov]

Codecov Report

Merging #135 into master will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##            master      #135   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            6         6           
  Lines           60        60           
  Branches        10        10           
=========================================
  Hits            60        60           

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update b40b90d...64d85c3. Read the comment docs.