Switch from Travis CI and AppVeyor to GitHub Actions

.github/workflows/ci.yaml

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+name: CI
+
+on:
+    pull_request:
+    push:
+        branches:
+            - master
+            - develop
+
+jobs:
+    tests:
+        name: Tests
+        runs-on: ${{ matrix.os }}
+        strategy:
+            fail-fast: false
+            matrix:
+                os:
+                    - ubuntu-latest
+                    - windows-latest
+                php:
+                    - '7.2'
+                    - '7.3'
+                    - '7.4'
+                    - '8.0'
+                dependencies:
+                    - lowest
+                    - highest
+
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: ${{ matrix.php }}
+                  coverage: xdebug
+
+            - name: Setup Problem Matchers for PHPUnit
+              run: echo "::add-matcher::${{ runner.tool_cache }}/phpunit.json"
+
+            - name: Determine Composer cache directory
+              id: composer-cache
+              run: echo "::set-output name=directory::$(composer config cache-dir)"
+
+            - name: Cache Composer dependencies
+              uses: actions/cache@v2
+              with:
+                  path: ${{ steps.composer-cache.outputs.directory }}
+                  key: ${{ runner.os }}-${{ matrix.php }}-composer-${{ matrix.dependencies }}-${{ hashFiles('**/composer.lock') }}
+                  restore-keys: ${{ runner.os }}-${{ matrix.php }}-${{ matrix.dependencies }}-composer-
+
+            - name: Install highest dependencies
+              run: composer update --no-progress --no-interaction --prefer-dist
+              if: ${{ matrix.dependencies == 'highest' }}
+
+            - name: Install lowest dependencies
+              run: composer update --no-progress --no-interaction --prefer-dist --prefer-lowest
+              if: ${{ matrix.dependencies == 'lowest' }}
+
+            - name: Run tests
+              run: vendor/bin/phpunit --coverage-clover=build/coverage-report.xml
+
+            - name: Upload code coverage
+              uses: codecov/codecov-action@v1
+              with:
+                  file: build/coverage-report.xml

.github/workflows/static-analysis.yaml

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+name: Code style and static analysis
+
+on:
+    pull_request:
+    push:
+        branches:
+            - master
+            - develop
+
+jobs:
+    php-cs-fixer:
+        name: PHP-CS-Fixer
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+              with:
+                  php-version: '7.4'
+
+            - name: Install dependencies
+              run: composer update --no-progress --no-interaction --prefer-dist
+
+            - name: Run script
+              run: composer phpcs
+
+    phpstan:
+        name: PHPStan
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+
+            - name: Install dependencies
+              run: composer update --no-progress --no-interaction --prefer-dist
+
+            - name: Run script
+              run: composer phpstan
+
+    psalm:
+        name: Psalm
+        runs-on: ubuntu-latest
+        steps:
+            - name: Checkout
+              uses: actions/checkout@v2
+
+            - name: Setup PHP
+              uses: shivammathur/setup-php@v2
+
+            - name: Install dependencies
+              run: composer update --no-progress --no-interaction --prefer-dist
+
+            - name: Run script
+              run: composer psalm