few small changes to README.md

[mikkokotila]

You want to make a PR to Talos

Thanks so much :) First, please take a moment to carefully check through
the below items:

Sanity

• I'm aware of the implications of the proposed changes
• Code is PEP8
• I'm making the PR to master
• I've updated the versions based on Semantic Versioning
  • talos/__init__.py
  • docs/index.html
  • docs/_coverpage.md

Docs

• Docs are updated

Tests

• Changes have gone through actual use testing
• All local tests have passed (run ./test.sh in /talos)
• Tests have been updated to reflect the changes

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