Indicate compatibility with psr/log 2 and 3

Signed-off-by: Alexander M. Turek <me@derrabus.de>

Author: derrabus

composer.json

@@ -22,7 +22,7 @@
     },
     "require": {
         "php": ">=7.1.3",
-        "psr/log": "^1.0",
+        "psr/log": "^1|^2|^3",
         "symfony/http-client-contracts": "^1.1.10|^2",
         "symfony/polyfill-php73": "^1.11",
         "symfony/service-contracts": "^1.0|^2"