Update astropy-helpers to v2.0.10

[bsipocz]

This is an automated update of the astropy-helpers submodule to v2.0.10. This includes both the update of the astropy-helpers sub-module, and the ah_bootstrap.py file, if needed.

A full list of changes can be found in the changelog.

This is intended to be helpful, but if you would prefer to manage these updates yourself, or if you notice any issues with this automated update, please let @bsipocz or @astrofrog know! Similarly to the core package, the v3.0+ releases of astropy-helpers require Python 3.5+. We will open automated update PRs with astropy-helpers v3.2.x only for packages that specifically opt in for it when they start supporting Python 3.5+ only. Please let @bsipocz or @astrofrog know or add your package to the list in https://github.com/astropy/astropy-procedures/blob/master/update-packages/helpers_3.py

[karllark]

This pull request introduces 2 alerts and fixes 6 when merging cdf424d03c58defabee7b065b18e39517bec2fff into 1f08938e21a81cfc02daf7cc738414149d3803b3 - view on LGTM.com

new alerts:

• 2 for Module is imported with 'import' and 'import from'

fixed alerts:

• 2 for Unused import
• 1 for Use of the return value of a procedure
• 1 for Module is imported more than once
• 1 for Except block handles 'BaseException'
• 1 for 'import *' may pollute namespace

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