Update User-Agent with the most recent version

[myprivateproxy]

Description

User-Agent header is too old and it should be updated

Motivation and Context

This fix possibly helps to prevent detecting a suspicious traffic and a resulting ban of proxies

How Has This Been Tested?

New header is from mitmproxy and a real PokémonGo on iOS

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[FrostTheFox]

Unlikely to be a major issue as this UA is CFNetwork and Darwin versions (which are generally speaking relative to iOS version, and thus not really an issue, as these current UAs were pulled from my own iPhone devices a couple iOS versions ago).

Still good to update though.

[myprivateproxy]

The answer is 'a couple iOS versions ago'. Most users update iOS within a week. Nevermind.

[FrostTheFox]

Okay, and? Niantic nor PTC are going to ban someone because they are using older iOS versions. We're talking within the major iOS version (so something like 11.1) here. I'm not speaking of iOS 8 here.\

I don't disagree with the change, otherwise I would have closed the PR. I don't think it's a MAJOR MERGE ASAP change though.

[FrostTheFox]

Checked these headers under latest iOS, iPhone X.

[fosJoddie]

These changes on it's own works fine (proxies are still banned).

However it is worth to point out that these changes ONLY changes the user agent of the proxy checks.

The user agent used for actual requests are defined in the pgoapi.

[sebastienvercammen]

PR also requires a pgoapi User-Agent update.