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 Information System Bom
+
+
+## [v2.0.0-SNAPSHOT] [r5.0.0] -
+
+- Switched JSON management to gcube-jackson [#19116]
+
+## [v1.5.0] [r4.21.0] - 2020-03-30
+
+- Upgraded OrientDB® from version 2.2.X to 3.0.X [#13180]
+
+
+## [v1.4.0] [r4.13.0] - 2018-11-20
+
+- Cleaned bom
+
+
+## [v1.3.0] [r4.9.0] - 2017-12-20
+
+- Updated OrientDB® Version to 2.2.30
+
+
+## [v1.2.0] [r4.5.0] - 2017-06-07
+
+- Updated OrientDB® Version to 2.2.18
+- Removed unneeded dependencies declaration (Thinkerpop™ Frames)
+
+
+## [v1.1.0] [r4.3.0] - 2017-03-16
+
+- Updated OrientDB® Version to 2.2.17
+
+
+## [v1.0.0] [r4.2.0] - 2016-12-16
+
+- First Release

changelog.xml

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-<?xml version="1.0" encoding="UTF-8"?>
-<!DOCTYPE xml>
-<ReleaseNotes>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-5-0" date="${buildDate}">
-		<Change>Upgraded OrientDB from version 2.2.X to 3.0.X</Change>
-	</Changeset>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-4-0" date="2018-11-20">
-		<Change>Cleaned BOM</Change>
-	</Changeset>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-3-0" date="2017-12-20">
-		<Change>Updated OrientDB Version to 2.2.30</Change>
-	</Changeset>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-2-0" date="2017-06-07">
-		<Change>Updated OrientDB Version to 2.2.18</Change>
-		<Change>Removed uneeded dependecies declaration (thinkerpopo frames)</Change>
-	</Changeset>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-1-0" date="2017-03-16">
-		<Change>Updated OrientDB Version to 2.2.17</Change>	
-	</Changeset>
-	<Changeset component="org.gcube.information-system.information-system-bom.1-0-0" date="2016-12-16">
-		<Change>First Release</Change>	
-	</Changeset>
-</ReleaseNotes>