The extended version with the looppointer linter

Motivation

As a Go developer, I actively use golangci-lint as a static linter,
but it doesn't support the looppointer linter. I need to extend it
to include the linter, which you can enable through the configuration:

linters:

  enable:
    - looppointer

or passing the argument

$ golangci-lint run --enable looppointer ./...

What's changed

• The golangci-lint supports the looppointer linter.
• The tool is available by brew install octolab/tap/golangci-lint.
• The installation is also possible by

  $ curl -sSfL https://install.octolab.org/golangci-lint | sh -s -- -b /usr/local/bin

Related issues

• golangci#1404
• golangci#1924
• golangci/golangci-lint@master...kamilsk:extended

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