[Proposal] Set maven urls based on the current regions

[jmatsu]

Issue

• close #361

Overview (Required)

• https://github.com/DroidKaigi/conference-app-2019/issues/168 and https://github.com/DroidKaigi/conference-app-2019/pull/326 are very useful so I'd like to make it better better better...
• This is just an idea based on the caller IP based region estimate
• I'm wondering where should be the default region... 🤔

Links

[jmatsu-bot]

Your app is deployed! Try it via https://deploygate.com/distributions/2c360a0fdbdfa81678f1b47370d63cc0ec9638ab

[jmatsu-bot]

Asserted successfully. :100:

Generated by :no_entry_sign: Danger

[jmatsu-bot]

Your app is deployed! Try it via https://deploygate.com/distributions/2c360a0fdbdfa81678f1b47370d63cc0ec9638ab

[jmatsu-bot]

Apk comparision results

Property	Summary
New File Size	13536188 Bytes. (12.91 MB)
File Size Change	-2255 Bytes. (-2.2 KB)
Download Size Change	+4445 Bytes. (+4.34 KB)
New Method Reference Count	150751
Method Reference Count Change	-42
New Number of dex file(s)	4
Number of dex file(s) Change	0

Generated by :no_entry_sign: Danger

[jmatsu]

I'd love to do benchmark though, the current results already show jcenter might be faster than US's google mirror. 😇 Let me do benchmark later.