Add support to ignore test files when using errcheck

[alaypatel07]

This PR solves #493 by adding without-tests field to errcheck.

Depends on golangci/errcheck#2

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[jirfag]

hi, thank you for the pull request!
we already have settings for ignoring test files for a specific linter:

  exclude-rules:
    # Exclude some linters from running on tests files.
    - path: _test\.go
      linters:
        - errcheck

can you use this solution?

[alaypatel07]

@jirfag Thanks for the alternative path, it worked for me.

I guess that makes this PR redundant, closing it and the issue. Thanks

[mattbirman]

Hey @jirfag, I am running into the same issue and this solution is not working for me.

In my .golangci.yml file I have the following:

exclude-rules:
    - path: _test\.go
      linters:
        - gosec

but golangci-lint still fails on gosec lint errors in *.test.go files. Do you have any idea why this may not be working?