Update version number to 1.2.2

Author: junichi11

manifest.mf

@@ -4,4 +4,4 @@ OpenIDE-Module: com.junichi11.netbeans.modules.rainbow.braces
 OpenIDE-Module-Install: com/junichi11/netbeans/modules/rainbow/braces/highlighting/Installer.class
 OpenIDE-Module-Layer: com/junichi11/netbeans/modules/rainbow/braces/resources/layer.xml
 OpenIDE-Module-Localizing-Bundle: com/junichi11/netbeans/modules/rainbow/braces/Bundle.properties
-OpenIDE-Module-Specification-Version: 1.2.1
+OpenIDE-Module-Specification-Version: 1.2.2