Update packages and remove dead dependencies.

143 files changed
tree: 9db1e0e3f778cee53a16747713718c6ae0229d0b
  1. README.md
  2. codereview.settings
  3. packages/
  4. pubspec.yaml
  5. roll.py
README.md

Snapshot of Observatory pub package dependencies needed to build

The pubspec.yaml in this repository is the source of truth