remove invalid class import

Author: modethirteen

src/CacheBuilder.php

@@ -18,7 +18,6 @@
 
 use Closure;
 use Exception;
-use modethirteen\FluentCache\Exception\BuildException;
 use Psr\EventDispatcher\EventDispatcherInterface;
 use Psr\SimpleCache\CacheException;
 use Psr\SimpleCache\CacheInterface;