Description of proposed changes

Resolve broken Continuous Documentation by changing miniconda installer URL from https://repo.continuum.io to https://repo.anaconda.com, because curl was not redirecting properly.

Also reported at MolSSI/cookiecutter-cms#103.

Fixes #

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If adding new functionality, add an example to docstrings or tutorials.