Add compatibility with Composer 2 (#398)

Author: villfa

.travis.yml

@@ -8,7 +8,8 @@ cache:
 
 env:
   global:
-    secure: "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"
+    - COMPOSER_VERSION='1'
+    - secure: "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"
 
 addons:
     apt:
@@ -21,12 +22,15 @@ matrix:
       env: COVERAGE='true'
     - php: '7.2'
     - php: '7.4'
+    - php: '7.4'
+      env: COMPOSER_VERSION='snapshot'
   fast_finish: true
 
 before_install:
   - echo "memory_limit=-1" >> ~/.phpenv/versions/$(phpenv version-name)/etc/conf.d/travis.ini
   - phpenv config-rm xdebug.ini || true
   - source .composer-root-version
+  - composer self-update --$COMPOSER_VERSION --no-interaction
   - |
       if [ "$COVERAGE" == "true" ]; then
         pecl install pcov;

composer.json

@@ -21,9 +21,9 @@
     "prefer-stable": true,
     "require": {
         "php": "^7.2",
+        "composer/package-versions-deprecated": "^1.8",
         "jetbrains/phpstorm-stubs": "dev-master",
         "nikic/php-parser": "^4.0",
-        "ocramius/package-versions": "^1.1",
         "symfony/console": "^3.2 || ^4.0",
         "symfony/filesystem": "^3.2 || ^4.0",
         "symfony/finder": "^3.2 || ^4.0"