Merge pull request #8 from ehibes/master

update psr/log version

Author: ekyna

Diff for: composer.json

@@ -21,7 +21,7 @@
         "php" : "^7.1|^8.0",
         "ext-json": "*",
         "payum/core": "^1.5",
-        "psr/log": "~1.0",
+        "psr/log": "~1.0|~2.0",
         "symfony/options-resolver": "~3.0|~4.0|~5.0",
         "sokil/php-isocodes": "~2.0|~3.0"
     },