Better error messages and recovery

[rocky]

If MythX fails, it can return the empty string rather than valid data - perhaps this is a Maestro bug? For now, we catch the string and turn it into and empty object.

Give a better error message on a timeout. And we don't want tracebacks either here.

Start release notes.

[coveralls]

Pull Request Test Coverage Report for Build 206

• 13 of 15 (86.67%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-1.3%) to 94.048%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
index.js	6	8	75.0%
<!--	Total:	13	15	86.67%	-->

Totals
Change from base Build 202:	-1.3%
Covered Lines:	222
Relevant Lines:	230

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💛 - Coveralls

[rocky]

Due to lack of time for getting a release out, the coveralls slippage I need to live with for now. @daniyarchambylov go back and see if you can get this fixed. It has to do with testing the custom error message that occurs when the ethereum address is invalid. I did spend a bit of time trying to figure out how to add a test but couldn't figure it out.