Fix small typo in README
Fix incorrect serialization of a single object inputted as an array. closes #1289
Bump version to 0.20.0
Update Podspec to v0.20.0
Merge branch 'release/0.20.0' into development
Fix issues with 304 caching when there are no Fetch Request Blocks registered that match the URL. closes #1294
Added needed hack
Save inverse mapping at object mapping, so it will be configurable