Switched changelog to the new format

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+
+## [v2.0.0-SNAPSHOT] [r5.0.0] - 
+
+- [#19283] Switched JSON management to gcube-jackson
+
+
+## [v1.2.0] [r4.21.0] - 2020-03-30
+
+- Updated gcube-bom version
+
+
+## [v1.1.0] [r4.17.0] - 2019-12-19
+
+- Added version already declared in gcube-bom to avoid that some component does not inherits the version
+- Removed -SNAPSHOT from dependencies lower bound of ranges
+
+## [v1.0.2] [r4.15.0] - 2019-11-08
+
+- Fixed distro files and pom according to new release procedure
+
+
+## [v1.0.1] [r4.13.1] - 2019-02-26
+
+- Added common-smartgears-utils dependency
+- Added gxHTTP dependency
+
+
+## [v1.0.0] [r4.2.0] - 2016-12-15
+
+- First Release
+

changelog.xml

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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE xml>
-<ReleaseNotes>
-	<Changeset component="org.gcube.distribution.gcube-smartgears-bom.1-2-0" date="${buildDate}">
-		<Change>Updated gcube-bom version</Change>
-	</Changeset>
-	<Changeset component="org.gcube.distribution.gcube-smartgears-bom.1-1-0" date="2019-12-19">
-		<Change>Added version already declared in gcube-bom to avoid that some component does not inherits the version</Change>
-		<Change>Removed -SNAPSHOT from dependencies lower bound of ranges</Change>
-	</Changeset>
-	<Changeset component="org.gcube.distribution.gcube-smartgears-bom.1-0-1" date="2019-02-26">
-		<Change>Added common-smartgears-utils dependency</Change>
-		<Change>Added gxHTTP dependency</Change>
-	</Changeset>
-	<Changeset component="org.gcube.distribution.gcube-smartgears-bom.1-0-0" date="2016-12-15">
-		<Change>First Release</Change>
-	</Changeset>
-</ReleaseNotes>