"cleanupIDs: false" still removes ID attributes from SVG nodes

[kettanaito]

Hey! Thank you for the awesome plugin. While using it, I've discovered what appears to be an unexpected behavior. I'd like to know your opinion on this.

Current behavior

Setting svgoConfig.cleanupIDs: false still removes id attributes from SVG nodes.

Expected behavior

Setting svgoConfig.cleanupIDs: false does not remove id attributes from SVG nodes.

Steps to reproduce

// gatsby-config.js
module.exports = {
  plugins: [
     {
      resolve: `gatsby-plugin-svgr`,
      options: {
        svgoConfig: {
          cleanupIDs: false,
        },
      },
    },
  ]
}

// example.svg
<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 28 28" focusable="false">
  <title>
    Gatsby
  </title>
  <circle cx="14" cy="14" r="14" fill="#639"/>
  <path id="i-should-persist" fill="#fff" d="M6.2 21.8C4.1 19.7 3 16.9 3 14.2L13.9 25c-2.8-.1-5.6-1.1-7.7-3.2zm10.2 2.9L3.3 11.6C4.4 6.7 8.8 3 14 3c3.7 0 6.9 1.8 8.9 4.5l-1.5 1.3C19.7 6.5 17 5 14 5c-3.9 0-7.2 2.5-8.5 6L17 22.5c2.9-1 5.1-3.5 5.8-6.5H18v-2h7c0 5.2-3.7 9.6-8.6 10.7z"/>
</svg>

In the compiled example.svg there is no `id="i-should-persist".

[zabute]

You should nest svgo config under the plugins key. See example config in readme. Ref: #38 & #40.