Merge pull request #122 from someniatko/allow-psalm-5

[composer.json] allow Psalm 5 beta

Author: orklah

composer.json

@@ -18,7 +18,7 @@
  "ext-simplexml": "*",
  "composer/semver": "^1.4 || ^2.0 || ^3.0",
  "composer/package-versions-deprecated": "^1.10",
- "vimeo/psalm": "dev-master || dev-4.x || ^4.5"
+ "vimeo/psalm": "dev-master || dev-4.x || ^4.5 || ^5@beta"
  },
  "conflict": {
  "phpunit/phpunit": "<7.5"