[GH-16] - non virtual received calls

[tpodolak]

Hi @dtchepak don't hesitate to suggest better diagnostic message. I used the one which is used for NS001 as this is very similar case but maybe you will come up with sth better

[coveralls]

Pull Request Test Coverage Report for Build j5y8xyx0vsjf9quu

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 1 unchanged line in 1 file lost coverage.
• Overall coverage decreased (-0.4%) to 96.901%

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Files with Coverage Reduction	New Missed Lines	%
../src/NSubstitute.Analyzers.Shared/Extensions/ISymbolExtensions.cs	1	91.67%

Totals
Change from base Build fhxoi1ir23y9e3d0:	-0.4%
Covered Lines:	469
Relevant Lines:	484

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💛 - Coveralls

[dtchepak]

Looks good to me. 👍