Igor Savin 26868f864c Fix event listener duplication (#2982)
* Fix event listener duplication. Start executing more tests in CI; fix broken test.

* Fix listener

* Fix listener

* Fix Node 6 support

* There doesn't seem to be a clear way to fix listener behaviour in Node 6, so let's just ignore it for the time being, especially considering that we are dropping support for Node 6 in April anyway.

* Update migration guide
2019-01-31 07:23:05 +02:00
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