Merge pull request #21 from slashrsm/allow_signalhandler_2

Allow seld/signal-handler 2.x and add missing dependency to psr/log.

Author: slashrsm

composer.json

@@ -25,9 +25,10 @@
     "require": {
         "php": ">=5.6.0",
         "portphp/portphp": "^1.0.0",
-        "seld/signal-handler": "^1.0",
+        "seld/signal-handler": "^1.0 || ^2.0",
         "symfony/property-access": "^2.3 || ^3.0 || ^4.0 || ^5.0 || ^6.0",
-        "symfony/validator": "^2.5 || ^3.0 || ^4.0 || ^5.0 || ^6.0"
+        "symfony/validator": "^2.5 || ^3.0 || ^4.0 || ^5.0 || ^6.0",
+        "psr/log": "^1.0 || ^2.0 || ^3.0"
     },
     "autoload": {
         "psr-4": {