feat: support new context API

[gregberge]

No description provided.

[codecov]

Codecov Report

Merging #65 into master will decrease coverage by 1.96%.
The diff coverage is 79.59%.

@@            Coverage Diff             @@
##           master      #65      +/-   ##
==========================================
- Coverage   90.28%   88.32%   -1.97%     
==========================================
  Files          16       16              
  Lines         175      197      +22     
  Branches       41       51      +10     
==========================================
+ Hits          158      174      +16     
- Misses         16       21       +5     
- Partials        1        2       +1

Impacted Files	Coverage Δ
src/server/index.js	80.48% <79.59%> (-2.85%)	⬇️

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[gregberge]

@gaearon we should not have to code the function walkTree. There is a similar one in Apollo getDataFromTree. Could you provide a React utility to do that?

[gregberge]

@gaearon I opened an issue in React facebook/react#12640