ErrSizedGroup (context, multierror)

[razor-87]

Hi,
yesterday I decided to take a closer look at the examples from the readme, in the process it turned out that the last example for ErrSizedGroup runs with an error cannot use func(ctx context.Context) error {…} (value of type func(ctx context.Context) error) as func() error value in argument to egrp.Go.

• implement the correct logic for context cancellation
• simplify the methods for the MultiError struct
• tried to reduce the number of explicit locks

[coveralls]

Pull Request Test Coverage Report for Build 6737635799

• 62 of 62 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.1%) to 100.0%

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Totals
Change from base Build 6286685592:	1.1%
Covered Lines:	183
Relevant Lines:	183

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💛 - Coveralls

[razor-87]

Error: "1 error(s) occurred: [0] {err from function 101}" does not contain "err from function 100"

hmm, again the same error in the test