Added symfony 5.1, changed type of Exception from Interface to concre…

…te implementation (#20)

composer.json

@@ -22,19 +22,19 @@
     "require": {
         "php": "^7.2",
         "jms/serializer": "^2.1 || ^3.0",
-        "symfony/messenger": "^4.4 || ^5.0"
+        "symfony/messenger": "^4.4 || ^5.1"
     },
     "require-dev": {
         "behat/behat": "^3.5",
         "behat/symfony2-extension": "^2.1",
         "jms/serializer-bundle": "^3.1",
         "matthiasnoback/symfony-dependency-injection-test": "^3.0",
         "phpunit/phpunit": "^7.4",
-        "symfony/config": "^4.2",
-        "symfony/debug": "^4.2",
-        "symfony/dependency-injection": "^4.2",
-        "symfony/framework-bundle": "^4.2",
-        "symfony/http-kernel": "^4.2"
+        "symfony/config": "^4.4 || ^5.1",
+        "symfony/debug": "^4.4 || ^5.1",
+        "symfony/dependency-injection": "^4.4 || ^5.1",
+        "symfony/framework-bundle": "^4.4 || ^5.1",
+        "symfony/http-kernel": "^4.4 || ^5.1"
     },
     "config": {
         "bin-dir": "bin",

src/Resources/config/serializer/Symfony.Component.ErrorHandler.Exception.FlattenException.xml

@@ -3,7 +3,7 @@
     <class name="Symfony\Component\ErrorHandler\Exception\FlattenException" exclusion-policy="ALL">
         <property name="message" type="string" expose="true" />
         <property name="code" type="int" expose="true" />
-        <property name="previous" type="Throwable" expose="true" />
+        <property name="previous" type="Symfony\Component\ErrorHandler\Exception\FlattenException" expose="true" />
         <property name="trace" type="array" expose="true" />
         <property name="traceAsString" type="string" expose="true" />
         <property name="class" type="string" expose="true" />