PSR2/PropertyDeclaration: allow for readonly keyword

Includes tests.

src/Standards/PSR2/Sniffs/Classes/PropertyDeclarationSniff.php

@@ -41,6 +41,7 @@ protected function processMemberVar(File $phpcsFile, $stackPtr)
         $find   = Tokens::$scopeModifiers;
         $find[] = T_VARIABLE;
         $find[] = T_VAR;
+        $find[] = T_READONLY;
         $find[] = T_SEMICOLON;
         $find[] = T_OPEN_CURLY_BRACKET;
 

src/Standards/PSR2/Tests/Classes/PropertyDeclarationUnitTest.inc

@@ -71,3 +71,13 @@ class MyClass
     public int   $var = null;
     public static int/*comment*/$var = null;
 }
+
+class ReadOnlyProp {
+    public readonly int $foo,
+        $bar,
+        $var = null;
+
+    protected readonly ?string    $foo;
+
+    readonly array $foo;
+}

src/Standards/PSR2/Tests/Classes/PropertyDeclarationUnitTest.inc.fixed

@@ -68,3 +68,13 @@ class MyClass
     public int $var = null;
     public static int /*comment*/$var = null;
 }
+
+class ReadOnlyProp {
+    public readonly int $foo,
+        $bar,
+        $var = null;
+
+    protected readonly ?string $foo;
+
+    readonly array $foo;
+}

src/Standards/PSR2/Tests/Classes/PropertyDeclarationUnitTest.php

@@ -46,6 +46,9 @@ public function getErrorList()
             69 => 1,
             71 => 1,
             72 => 1,
+            76 => 1,
+            80 => 1,
+            82 => 1,
         ];
 
     }//end getErrorList()