toString fix

Author: adapik

src/ASN1/ImplicitlyTaggedObject.php

@@ -33,4 +33,9 @@ public function getStringValue()
     {
         return $this->content->binaryData;
     }
+
+    public function __toString(): string
+    {
+        return '['.$this->getIdentifier()->getTagNumber().']' . implode("\n", $this->decoratedObjects);
+    }
 }

src/ASN1/Universal/EOC.php

@@ -29,4 +29,9 @@ protected function getEncodedValue()
     {
         return null;
     }
+
+    public function __toString(): string
+    {
+        return '';
+    }
 }