Update README.md

[blueicehaller]

link to JSON API has been changed

Summary

What kind of change does this PR introduce? (check at least one)

• Bugfix
• Feature
• Code style update
• Refactor
• Docs
• Build-related changes
• Other, please describe:

If changing the UI of web configuration, please provide the before/after screenshot:

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing setups:

The PR fulfills these requirements:

• When resolving a specific issue, it's referenced in the PR's body (e.g. Fixes: #xxx[,#xxx], where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature
• Related documents have been updated (docs/docs/en)
• Related tests have been updated

PLEASE DON'T FORGET TO ADD YOUR CHANGES TO CHANGELOG.MD

• Yes, CHANGELOG.md is also updated

To avoid wasting your time, it's best to open a feature request issue first and wait for approval before working on it.

Other information:

[Paulchen-Panther]

Could you summarize your PRs (#1773, #1774, #1775, #1776, #1777, #1778) into one?
You can find instructions here: https://stackoverflow.com/a/47074262/4517819

Thank you very much.

[blueicehaller]

I hope I have done it correctly. Here are my changes:

origin/patch-2

Google Play link is no longer available https://play.google.com/store/apps/details?id=nl.hyperion.hyperionpro .
As an alternative you can delete this text: like our Android app)
27 * Priority channels are not coupled to a specific led data provider which means that a provider can post led data and leave without the need to maintain a connection to Hyperion. This is ideal for a remote application (like our former [Android app](https://play.google.com/store/apps/details?id=nl.hyperion.hyperionpro), which is no longer available).

origin/patch-3

link to Hardware LED devices has been changed
34 You can find a list of supported hardware [here](https://docs.hyperion-project.org/user/leddevices/Overview.html).

origin/patch-4

link to Documentation Configuration has been changed
54 - [Configuration](https://docs.hyperion-project.org/user/Configuration.html)

origin/patch-5

link to Effect development has been changed
55 - [Effect development](https://docs.hyperion-project.org/effects/Effects.html)

origin/patch-6

link to JSON API has been changed
56 - [JSON API](https://docs.hyperion-project.org/json/JSON.html)

origin/patch-1

Installation link has been changed to Getting started
67 See [Documentation](https://docs.hyperion-project.org/user/GettingStarted.html) or on the [Release Repository](https://releases.hyperion-project.org).

In my forked repository https://github.com/blueicehaller/hyperion.ng it shows:
This branch is 7 commits ahead of hyperion-project/hyperion.ng:master.
[ Contribute ] [ Sync fork ]

[Paulchen-Panther]

Then please close all pull requests and open a new request that points to your master branch.

Thank you very much