Added changelog

CHANGELOG.md

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+# Version 0.3 (2021-07-05)
+- Added `enable_integrity_monitoring` and `enable_secure_boot` both to `true` as default
+- Added `target_tags` to the ingress-nginx firewall rule
+- Removed Service Account impersonation (this should be set outside of this module)
+- Possibility to define custom cluster's master authorized networks
+- Possibility to specify the HTTP endpoint for the automatic retrival of the machine's public IP (used as default master authorized network)
+
+# Version 0.2 (2021-06-28)
+- Added support for custom node pools tains and labels
+
+# Version 0.1 (2021-06-24)
+- First release!