Add chunk getting with integer values (#55)

* Add chunk getting with integer values

* Add field getting for chunk json

* Update test_doc_utils.py

* Update test_doc_utils.py

* Update test_doc_utils.py

v0.2.2 release

Merge branch 'master' of https://github.com/vector-ai/vectorai

v0.2.0 release

v0.1.0 release