Pass type to onUpdate

[diegohaz]

Fix #21

[codecov-io]

Codecov Report

Merging #23 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff          @@
##           master    #23   +/-   ##
=====================================
  Coverage     100%   100%           
=====================================
  Files           6      6           
  Lines         113    121    +8     
  Branches       29     30    +1     
=====================================
+ Hits          113    121    +8

Impacted Files	Coverage Δ
src/mount.js	100% <100%> (ø)	⬆️
src/ContextContainer.js	100% <100%> (ø)	⬆️
src/utils.js	100% <100%> (ø)	⬆️
src/Container.js	100% <100%> (ø)	⬆️

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