fixes #44

[hoschi]

My try for #44, let me now if something should be different.

[codecov]

Codecov Report

Merging #74 into master will decrease coverage by 4.79%.
The diff coverage is 100%.

@@            Coverage Diff            @@
##           master      #74     +/-   ##
=========================================
- Coverage   94.38%   89.58%   -4.8%     
=========================================
  Files           3        3             
  Lines          89       96      +7     
  Branches       25       27      +2     
=========================================
+ Hits           84       86      +2     
- Misses          5        8      +3     
- Partials        0        2      +2

Impacted Files	Coverage Δ
src/asyncComponent.js	89.74% <100%> (-3.22%)	⬇️
src/createAsyncContext.js	75% <0%> (-25%)	⬇️

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