added helper that uses d3.js modules

[vgshenoy]

Advantage over tweenjs and tweezer is that d3-interpolate supports tweening of colors and svg paths too. Usage is as in this example https://codesandbox.io/s/l25l5v35ql

[posva]

This is pretty nice! Thanks! Could you add a new test file and some tests as it is done with the two other engines?

[codecov-io]

Codecov Report

Merging #8 into master will increase coverage by 2.39%. The diff coverage is 100%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
+ Coverage   87.14%   89.53%   +2.39%     
==========================================
  Files           1        1              
  Lines          70       86      +16     
  Branches       17       20       +3     
==========================================
+ Hits           61       77      +16     
  Misses          6        6              
  Partials        3        3

Impacted Files	Coverage Δ
src/index.js	89.53% <100%> (+2.39%)	:arrow_up:

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[posva]

This is really cool. Thanks a lot for the contribution, really! I'm working on some other things and want to add proper docs for Vue Tweezing and document the helpers. Could I ping you later on to help me with that, please?

[vgshenoy]

Thank you for putting this out, been enjoying using this for some data visualisations I've been playing with. And yes definitely, will be glad to help with the docs!