Update NEWS.md

Merge pull request #542 from CartoDB/development

Client 0.26.1, Server 0.35.1 -> Fix batch geocoder geometry type

Python library 0.21.1

Python 0.21.0

Merge pull request #537 from CartoDB/development

Release 0.35.0 for server extension

Merge pull request #535 from CartoDB/development

Release 0.34.2

Merge pull request #534 from CartoDB/development

Release 0.34.1 of the server extension

Merge pull request #529 from CartoDB/development

Release version 0.20.2 for python library

Merge pull request #524 from CartoDB/development

Release python library 0.20.1

Use dataservices with non-master keys