Readme: added notification to use stack overflow for questions

[chrisbeardy]

No description provided.

[coveralls]

Pull Request Test Coverage Report for Build 7586025828

Warning: This coverage report may be inaccurate.

We've detected an issue with your CI configuration that might affect the accuracy of this pull request's coverage report.
To ensure accuracy in future PRs, please see these guidelines.
A quick fix for this PR: rebase it; your next report should be accurate.

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.1%) to 94.404%

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Totals
Change from base Build 1863652691:	-0.1%
Covered Lines:	1704
Relevant Lines:	1805

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💛 - Coveralls