Added new subscriber callback#6

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pennyandsean wants to merge 8 commits intoyehya:masterfrom

inerva:feature/subscriber-callback

Commits on Jan 3, 2018

Added new subscriber callback. Updated basic example and readme.
inerva-sean
committed

Commits on May 4, 2018

Updated subscriber callback parameters.
inerva-sean
committed

Commits on Jan 25, 2019

Update package.json
yehya
authored

Commits on Jan 26, 2019

Merge pull request #9 from yehya/updateLodash
yehya
authored

Commits on Feb 16, 2019

fix listener leak

nimast
authored and
yehya
committed

Commits on Oct 16, 2019