bump forgotten version number

VERSIONS

-19/06/2014 - 6.45.4
+19/06/2014 - v6.45.4
 - ticket #13837: SIGB Microbib: correction lecture titres contenant le caractère 0xca (°)
 
 - ticket #13302: 

library/startup.php

@@ -56,7 +56,7 @@ function defineConstant($name, $value) {
 
 function setupConstants() {
 	defineConstant('VERSION_PERGAME','6.45');
-	defineConstant('RELEASE_NUMBER', VERSION_PERGAME.'.3');
+	defineConstant('RELEASE_NUMBER', VERSION_PERGAME.'.4');
 
 	defineConstant('ROOT_PATH',  realpath(dirname(__FILE__).'/..').'/');