Switched changelog to the new format

CHANGELOG.md

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+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+# Changelog for gCube Catalogue (gCat) API
+
+
+## [v2.0.0-SNAPSHOT] [r5.0.0] - 
+
+- Switched JSON management to gcube-jackson [#19735]
+
+
+## [v1.2.1] [r4.18.0] - 2019-12-10
+
+- Fixed distro files and pom according to new release procedure
+
+
+## [v1.2.0]  [r4.15.0] - 2019-11-06
+
+- Added org parameter to support to list item at VO level in gCat Service [#17635]
+
+
+## [v1.1.0] [r4.14.0] - 2019-05-27
+
+- Added Social Post parameter [#13335]
+
+
+## [v1.0.0] [r4.13.1] - 2019-02-26
+
+- First Release
+

changelog.xml

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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE xml>
-<ReleaseNotes>
-	<Changeset component="org.gcube.data-publishing.gcat-api.1-2-1" date="${buildDate}">
-		<Change>Fixed distro files and pom according to new release procedure</Change>
-	</Changeset>
-	<Changeset component="org.gcube.data-publishing.gcat-api.1-2-0" date="2019-11-06">
-		<Change>Added org parameter to support to list item at VO level in gCat Service #17635</Change>
-	</Changeset>
-	<Changeset component="org.gcube.data-publishing.gcat-api.1-1-0" date="2019-05-27">
-		<Change>Added Social Post parameter refs #16322</Change>
-	</Changeset>
-	<Changeset component="org.gcube.data-publishing.gcat-api.1-0-0" date="2019-02-26">
-		<Change>First Release</Change>
-	</Changeset>
-</ReleaseNotes>