Fix prepare algorithm with new Provider/Context api

[ganemone]

This fixes a bug where the prepare algorithm stopped traversing once it hit a component generated from the new react context API. This would break server side data fetching for any users using the React.createContext API.

[codecov]

Codecov Report

Merging #109 into master will decrease coverage by 0.53%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #109      +/-   ##
==========================================
- Coverage   78.62%   78.08%   -0.54%     
==========================================
  Files           9        9              
  Lines         145      146       +1     
  Branches       36       34       -2     
==========================================
  Hits          114      114              
- Misses         20       21       +1     
  Partials       11       11

Impacted Files	Coverage Δ
src/prepare.js	90.9% <100%> (+0.21%)	⬆️
src/dispatched.js	12.5% <0%> (-12.5%)	⬇️

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[ganemone]

!merge