Remove non-existent argument from `context`
Remove non-existent argument from `context`

The `onErr` argument no longer exists on the `context` and `wrap` methods
as of Raven 2.0.0

https://github.com/getsentry/raven-node/commit/8a88d5d4f8ed92b62345c6bb3f79f98de65461fe

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