Re-enable several linters

[nodivbyzero]

Fixes Or Enhances

This PR re-enables several previously disabled linters and resolves the following linter issues:

• Unnecessary leading newline (whitespace)
• Unnecessary trailing newline (whitespace)

Make sure that you've checked the boxes below before you submit PR:

• Tests exist or have been written that cover this particular change.

@go-playground/validator-maintainers

[coveralls]

coverage: 73.607% (-0.6%) from 74.225%
when pulling 71115f7 on nodivbyzero:enable-more-linters
into de24491 on go-playground:master.

[deankarn]

LGTM as long as running gofmt, with its default settings, doesn’t put them back/ fight against the linter. Because that’s how I and expect everyone to format the code, using gofmt/goimports with the defaults.

[nodivbyzero]

Got it, totally agree.