Changelog update for new structures

src/changes/changes.xml

@@ -25,10 +25,29 @@
 					<li>commons-lang3 (Core): 3.8.1 -&gt; 3.9</li>
 					<li>commons-text (Core): 1.6 -&gt; 1.7</li>
 					<li>Guava (JPA): 27.1-jre -&gt; 28.0-jre</li>
-					<li>
 				</ul>
 				]]>
 			</action>
+			<action type="change">
+				<![CDATA[
+				<b>Breaking Change</b>:
+				The HL7.org DSTU2 structures (and <i>ONLY</i> the HL7.org DSTU2 structures) have been
+				moved to a new package. Where they were previously found in 
+				<code>org.hl7.fhir.instance.model</code>
+				they are now found in
+				<code>org.hl7.fhir.dstu2.model</code>. This was done in order to complete the harmonization
+				between the 
+				<a href="https://github.com/jamesagnew/hapi-fhir">HAPI FHIR</a>
+				GitHub repository and the 
+				<a href="https://github.com/hapifhir/org.hl7.fhir.core/">org.hl7.fhir.core</a>
+				GitHub repository. This is the kind of change we don't make lightly, as we do know that it
+				will be annoying for users of the existing library. It is a change however that will allow us
+				to apply validator fixes much more quickly, and will greatly reduce the amount of effort
+				required to keep up with R5 changes as they come out, so we're hoping it is worth it.
+				Note that no classes are removed, they have only been moved, so it should be fairly straightforward
+				to migrate existing code with an IDE.
+				]]>
+			</action>
 			<action type="change">
 				<![CDATA[
 				<b>Breaking Change</b>: