Fix JSON unmarshalling in complex structures bug

[barweiss]

Add documentation in README about JSON marshalling

[coveralls]

Pull Request Test Coverage Report for Build 5216490448

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
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• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 180 of 180 (100.0%) changed or added relevant lines in 9 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 100.0%

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Totals
Change from base Build 5215642678:	0.0%
Covered Lines:	1590
Relevant Lines:	1590

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💛 - Coveralls