Add deprecation for removal notice for PluginVersionIdentifier

Deprecated for removal in
eclipse-equinox/equinox#427

eclipse.platform.common/bundles/org.eclipse.platform.doc.isv/porting/removals.html

@@ -282,6 +282,10 @@ <h3 id="osgi.service-bundle">1. Bundle org.eclipse.osgi.services</h3>
 This allows the OSGi runtime to choose any suitable provider of the package that is available. 
 </p>
 
+<h3 id="PluginVersionIdentifier">2. PluginVersionIdentifier</h3>
+
+The class <code>org.eclipse.core.runtime.PluginVersionIdentifier</code> is deprecated for removal.
+As replacement <code>org.osgi.framework.Version</code> should be used.
 
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