Getting dataCorrupted from SwiftLint

Here is my danger.yml:
```name: Danger
on:
pull_request:
branches: [ master ]

jobs:
build:
runs-on: ubuntu-latest
name: "Run Danger"
steps:
- uses: actions/checkout@v1
- name: Danger
uses: danger/swift@3.0.0
with:
args: --failOnErrors --no-publish-check
env:
GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
```

Here is my Dangerfile.swift:
```
import Danger

let danger = Danger()

SwiftLint.lint(swiftlintPath: "./Pods/SwiftLint/swiftlint")

// Ensure no copyright header
let editedFiles = danger.git.modifiedFiles + danger.git.createdFiles
let swiftFilesWithCopyright = editedFiles.filter {
$0.contains("Copyright") && ($0.fileType == .swift || $0.fileType == .m)
}
for file in swiftFilesWithCopyright {
fail(message: "Please remove this copyright header", file: file, line: 0)
}

// Encourage smaller PRs
var bigPRThreshold = 600;
if (danger.github.pullRequest.additions! + danger.github.pullRequest.deletions! > bigPRThreshold) {
warn("> Pull Request size seems relatively large. If this Pull Request contains multiple changes, please split each into separate PR will helps faster, easier review.");
}
```

I'm not sure why this is happening or how to fix it. I tried the SwiftLint action here (https://github.com/norio-nomura/action-swiftlint) and everything worked fine. Just the Danger SwiftLint plugin seems to barf every time :(

Here is a related issue: https://github.com/danger/swift/issues/266
I tried to open that issue but I didn't see a button to open it.

Start by reproducing the workflow from danger.yml with the Dangerfile.swift call to SwiftLint.lint, then read the related issue #266 and the 13-comment thread for existing diagnosis. Compare the failing Danger SwiftLint plugin invocation with the working SwiftLint action; done means the workflow runs without dataCorrupted and reports SwiftLint results correctly.

Written by the indexing model from the issue text.