Upgrade JSON schema validator + fixes #811

	# Verify pull requests on develop.

	name: Verify pull requests

	on:
	pull_request:
	branches:
	- develop

	jobs:
	unit-tests-pass:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 1

	- name: Gradle wrapper validation
	uses: gradle/[email protected]

	- name: Build and test
	run: ./gradlew build

	verify-typescript-declarations:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 1

	- name: Build and test
	run: ./gradlew verifyTsDeclarations

	code-analysis:
	runs-on: ubuntu-latest
	steps:
	- name: Checkout
	uses: actions/checkout@v2
	with:
	fetch-depth: 1

	- name: Code analysis
	run: ./gradlew detektPasses

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