Add gotoOptions param and update README.md

[myisaak]

This PR allows one to include the following code that configures puppeteer to wait until "networkIdle0". This fixes the issue I had, where I wasn't able to configure the "waitUntil" prop.

new PuppeteerPlugin({
  // ....
  gotoOptions: { waitUntil: "networkIdle0" },
})

[s0ph1e]

Hi @myisaak 👋

First of all, thank you for your contribution 👍
I'm very sorry for the super-late response, I've somehow lost this PR.
Going to test it and if everything works fine - merge and release in the nearest few days

[s0ph1e]

Released in version 1.1.0
Thank you again for the PR!