Pass next state to event definitions

[ttmarek]

@timestep have a look, and let me know if this meets your needs.

[codecov]

Codecov Report

Merging #117 into master will increase coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #117      +/-   ##
==========================================
+ Coverage   97.33%   97.35%   +0.02%     
==========================================
  Files          30       30              
  Lines         300      303       +3     
==========================================
+ Hits          292      295       +3     
  Misses          8        8

Impacted Files	Coverage Δ
src/main/create-meta-reducer.js	100% <100%> (ø)	⬆️
src/main/create-middleware.js	100% <100%> (ø)	⬆️
src/main/create-events.js	100% <100%> (ø)	⬆️

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