BB-455: Update Flow Version

[chinmay-kothari]

Problem

Upgrading the flow version from the 0.69.0 to the latest, 0.123.0

Solution

I first removed the current flow version with sudo rm -rf path then yarn global add flow-bin@latest then after that npm install flow-bin@latest.

Areas of Impact

package.json
package-lock.json

I haven't changed the source codebase because on doing yarn create flow-upgrade --all it did following changes in around 103 files disturbing the eslint-sort:
import React from 'react'; changed to import * as React from 'react';

class Achievement extends React.Component { to class Achievement extends React.Component<$FlowFixMeProps, $FlowFixMeState> {

[coveralls]

Coverage remained the same at 49.99% when pulling b2e955d on chinmay-kothari:flow_version into b09817a on bookbrainz:master.

[chinmay-kothari]

@MonkeyDo
On running the local server using npm, the server is getting started with many warnings which I guess are associated with the previous flow version.
I may be totally wrong in this so can you please take a look into this. Thanks

[MonkeyDo]

@chinmay-kothari Not to worry, the warnings are from ESLint, not with Flow, and they were not introduced with your PR.

However, something I haven't done in a while is run npm run flow which shows a lot of flow type errors.
If you feel like this is something you would like to tackle, you can open a new PR to try to fix some of those; it will likely be a little-by-little sort of job (just like the ESLint warnings you saw).

In any case, this PR is ready to be merged. Thanks :)