Fix warning reported by LuaCheck (#563)

David Leal

2020-09-05 11f2b4f4b317a25972733e3d3fe9f2dc6ce31c6a

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on: [push, pull_request]
name: Check & Release
jobs:
  lint:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@master
      - name: lint
        uses: Roang-zero1/factorio-mod-luacheck@master
        with:
          luacheckrc_url: ""