Update Opera versions

[queengooborg]

This PR updates Opera releases to match latest updates. Based upon https://help.opera.com/en/opera-version-history/, it looks like version 59 never left beta before they released version 60, codenamed "Reborn 3". Thus, no release notes or release date was actually made for Opera 59.

[Elchi3]

So, version 59 does not really exist then? Sigh. I guess it would be easier to still have it listed here?

Technically, the features in "59" (Chromium 72) are only available to end-users in version 60 along with everything from Chromium 73 then, I guess.

Edit: Another situation where I wish the vendor would comment and help us to communicate their versions in their preferred way.

[queengooborg]

That’s what it seems like to me. Unlike Opera Android though, I’m glad they continued with the version numbers as normal, rather than confuse us! Since Opera 59 still had a beta release, I feel that we should leave it in our data.

[Elchi3]

Since Opera 59 still had a beta release, I feel that we should leave it in our data.

Well, I think, for other browsers, we didn't add non-releases like beta versions. In the Firefox Android data, for example, we've left out beta versions. How much is Opera 59 already populated in the data set?

[queengooborg]

Ah, makes sense. It looks like there was only four instances across three files that referenced Opera 59:

api/FetchEvent.json
http/headers/feature-policy.json - 2 times
javascript/builtins/JSON.json

[Elchi3]

Then, I think, we should remove 59 and mark those as shipped in Opera 60 instead.

[queengooborg]

Works for me!

[Elchi3]

Thanks! I have no contact to Opera to ask for opinions, thus going ahead with this PR, as it seems most consistent to what we've done for other browsers.