Bump to 0.2.0-SNAPSHOT since #162 changes some service APIs
Parsing JSON keys as keywords is now the default

Fixes #110

This behavior can be overridden by constructing a `body-params` by doing
`(body-params (default-parser-map :json-options {:key-fn nil}))`.
Update CHANGELOG with 0.2.0 deprecation messages
Update relative links in CHANGELOG.md for 0.2.0
Merge pull request #163 from pedestal/two-oh-loose-ends

JSON changes for upcoming 0.2.0 release