Fix wrong class for DBAL type in README

Author: teohhanhui

README.md

@@ -13,7 +13,7 @@ A simple to use set of database types, and annotations to use postgresql's full
  * Register Doctrine Type:
 
  ```php
- Type::addType('tsvector',\VertigoLabs\DoctrineFullTextPostgres\ORM\Mapping\TsVectorType::class);
+ Type::addType('tsvector',\VertigoLabs\DoctrineFullTextPostgres\DBAL\Types\TsVector::class);
  ```
  * Register Doctrine Event Subscriber
 
@@ -104,4 +104,4 @@ A simple to use set of database types, and annotations to use postgresql's full
 
 ## TODO
  * Add language to SQL field definition
- * Add language and weighting to queries
+ * Add language and weighting to queries