update dependency installs in dockerfile (NVIDIA#164)

Update docs (NVIDIA#117)

* update docs after GNN datapipe refactor

* add docs for other models, utils

* add dates to CHANGELOG

Version update 0.2.0 (NVIDIA#96)

* Version update 0.2.0

* Update CHANGELOG.md

* Update bug_report.yml

fix dgl install (NVIDIA#32)

Co-authored-by: Kaustubh Tangsali <[email protected]>