Increased module version after adding new API methods

Author: jisedlac

visualvm/core/manifest.mf

@@ -5,5 +5,5 @@ OpenIDE-Module: org.graalvm.visualvm.core/0
 OpenIDE-Module-Layer: org/graalvm/visualvm/core/layer.xml
 OpenIDE-Module-Localizing-Bundle: org/graalvm/visualvm/core/Bundle.properties
 OpenIDE-Module-Install: org/graalvm/visualvm/core/Install.class
-OpenIDE-Module-Specification-Version: 1.6
+OpenIDE-Module-Specification-Version: 1.7