Update version number to 0.9.0

Author: junichi11

manifest.mf

@@ -2,4 +2,4 @@ Manifest-Version: 1.0
 OpenIDE-Module: org.netbeans.modules.php.phpcsfixer
 OpenIDE-Module-Install: org/netbeans/modules/php/phpcsfixer/Installer.class
 OpenIDE-Module-Localizing-Bundle: org/netbeans/modules/php/phpcsfixer/Bundle.properties
-OpenIDE-Module-Specification-Version: 0.8.1
+OpenIDE-Module-Specification-Version: 0.9.0