Update badges to use shields

[ethanhs]

Addresses #17

Let me know if you want any tweaks to the order etc.

[jirikuncar]

@ethanhs the README.rst looks good. The idea behind #17 was to also update docs/index.rst and docs/conf.py (setup.py for Sphinx version) according to our latest Cookiecutter template so we can fully close it. Otherwise, I can just squash merge and amend the commit messages to follow our organization style and use (addresses #17) instead of Resolves.

• https://raw.githubusercontent.com/inveniosoftware/cookiecutter-invenio-module/master/%7B%7B%20cookiecutter.project_shortname%20%7D%7D/docs/index.rst
• https://raw.githubusercontent.com/inveniosoftware/cookiecutter-invenio-module/master/%7B%7B%20cookiecutter.project_shortname%20%7D%7D/docs/conf.py
• https://raw.githubusercontent.com/inveniosoftware/cookiecutter-invenio-module/master/%7B%7B%20cookiecutter.project_shortname%20%7D%7D/setup.py

[ethanhs]

Ah, I see. I'll close this PR and open a new one that resolves #17 as you desire.

[jirikuncar]

@ethanhs you can force push to the same branch. There is no need in closing the PR.

Check https://guides.github.com/introduction/flow/

[ethanhs]

@jirikuncar Go ahead and squash merge and I've changed resolves to addresses.

[lnielsen]

LGTM