Added ability to indent spinners

[techieji]

#146: Allows spinners to be indented. Added a test case. Also, this is my first PR, so could you tell me if I'm going wrong somewhere?

Description of new feature, or changes

Allows a spinner to be preceded by a string given by the keyword argument indent.

Checklist

• [x] Your branch is up-to-date with the base branch
• [x] You've included at least one test if this is a new feature
• [x] All tests are passing

Related Issues and Discussions

Fixes #146

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