chore: set back to dev mode, one more feature planned

Author: williamdes

src/Doctum.php

@@ -51,7 +51,7 @@ class Doctum implements ArrayAccess
     public const VERSION_MAJOR = 5;
     public const VERSION_MINOR = 4;
     public const VERSION_PATCH = 1;
-    public const IS_DEV        = false;
+    public const IS_DEV        = true;
 
     //@phpstan-ignore-next-line
     public const VERSION = self::VERSION_MAJOR . '.' . self::VERSION_MINOR . '.' . self::VERSION_PATCH . (self::IS_DEV ? '-dev' : '');