Upgrade react-native to 0.61 about mapswipe HOT 7 CLOSED

Some notes about upgrading react-native. The process is widely regarded as the worst part of the framework. There are a few tools to help upgrade automatically, but it seems that manual upgrades are still the most reliable path.
Based on this blog post and a few other bits, plus my own attempts, it seems that the easiest path is:

• git checkout -b rn-upgrade-branch
• run tests and checks to ensure they all pass before breaking stuff
• get the diff to apply from https://pvinis.github.io/purge-web/ for instance: https://github.com/react-native-community/rn-diff-purge/compare/release/0.57.8..release/0.58.0
• apply the diff by hand, for javascript, android and iOS
• this will include a change of dependency versions in package.json. Make sure you run yarn install after this, or the following steps won't work
• iOS specific stuff
  • cd ios
  • rm Podfile.lock
  • bundle exec pod install // this probably needs to happen on a mac, as cocoapods will sometimes fail on other OSes :(
• test the app again
• if it works, you're done 🎉
• cd ..
• git add .
• git commit -m "Upgrade react-native to XXX"

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Current RN version is 0.58.0. Looking at changelogs, upgrade up to 0.58.6 should be painless, the next step (to 0.59.0+) may require changes to the rnfirebase library

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Upgrade to RN 0.59 is required before august 1, 2019 to support android 64 bits (see http://facebook.github.io/react-native/blog/2019/03/12/releasing-react-native-059)

It is unclear what will happen in august if the app is not compatible though...

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From react-native version 0.59.x onwards, the upgrade should be done using react-native upgrade instead of the above process... To be tested!

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Upgrading to 0.60 would probably required looking into #86

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Upgrade to react-native 0.60 requires moving to androidX infrastructure for android, which looks like a potential big job, with breaking changes.

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Released in 2.0.3 🎉

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