Remove composer's deprecation psr-0 notice

When use 'composer dump-autoload -o' command with composer 1.10.8 next deprecation notice appears:

Deprecation Notice: Class Doctrine_Validator_HtmlColor located in ./vendor/friendsofsymfony1/doctrine1/lib/Doctrine/Validator/Htmlcolor.php does not comply with psr-0 autoloading standard. It will not autoload anymore in Composer v2.0. in phar:///usr/local/Cellar/composer/1.10.8/bin/composer/src/Composer/Autoload/ClassMapGenerator.php:201

This fix just changes the file name to comply with psr-0

lib/Doctrine/Validator/Htmlcolor.php → lib/Doctrine/Validator/HtmlColor.php

@@ -1,6 +1,6 @@
 <?php
 /*
- *  $Id: Htmlcolor.php 7490 2010-03-29 19:53:27Z jwage $
+ *  $Id: HtmlColor.php 7490 2010-03-29 19:53:27Z jwage $
  *
  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
@@ -48,4 +48,4 @@ public function validate($value)
         }
         return true;
     }
-}
+}