Support replication of deleted docs from FS driver

Merge pull request #35 from go-kivik/repldel3

Support replication of deleted documents from FS driver

Include changed revs in replication events

Merge pull request #33 from go-kivik/changes3

Include changed revs in events

Add support for an event emitter to the Replicate function

Merge pull request #31 from go-kivik/events3

Add an event-emitter for replication events

Update dependencies and linter

No functional changes.

v3.0.0: Merge pull request #25 from go-kivik/version3

Update paths for v3

First tagged release

Merge pull request #22 from go-kivik/mod2

Update tests for go.mod compatibility