format improvements

CHANGELOG.md

@@ -1,14 +1,12 @@
 
-## 21 October 2021
-### ATT&CK Spec v2.1.0
+## 21 October 2021 - ATT&CK Spec v2.1.0
 Changes to STIX for October 2021 ATT&CK Content Release (ATT&CK-v10.0)
 
 Added full objects for data sources and data components. See [the data sources section of the USAGE document](https://github.com/mitre/cti/blob/master/USAGE.md#data-sources-and-data-components) for more information about data sources, data components, and their relationships with techniques.
 
 Additional data-model improvements with ATT&CK Spec v2.1.0 can be found on [attack-stix-data](https://github.com/mitre-attack/attack-stix-data). See [the changelog](https://github.com/mitre-attack/attack-stix-data/blob/master/CHANGELOG.md) on that repository for more information.
 
-## 21 June 2021
-### ATT&CK Spec v2.0.0
+## 21 June 2021 - ATT&CK Spec v2.0.0
 Release of ATT&CK in STIX 2.1.
 
 The contents of this repository is not affected, but you can find ATT&CK in STIX 2.1 (ATT&CK spec v2.0.0+) on our new [attack-stix-data](https://github.com/mitre-attack/attack-stix-data) GitHub repository. Both MITRE/CTI (this repository) and attack-stix-data will be maintained and updated with new ATT&CK releases for the foreseeable future, but the data model of attack-stix-data includes quality-of-life improvements not found on MITRE/CTI. Please see the [attack-stix-data USAGE document](https://github.com/mitre-attack/attack-stix-data) for more information on the improved data model of that repository.
@@ -29,8 +27,7 @@ Changes to STIX for October 2020 ATT&CK Content Release (ATT&CK-v8.0)
 2. Deprecated the pre-ATT&CK domain. Pre-ATT&CK has been migrated to two new tactics in the Enterprise domain tagged with the `PRE` platform. Please see the new [PRE matrix](https://attack.mitre.org/matrices/enterprise/PRE/) for the replacing Enterprise tactics and techniques. All objects within the pre-ATT&CK domain have been marked as deprecated, along with a new description pointing to their new home in Enterprise.
 3. Added the [ATT&CK for ICS domain](ics-attack).
 
-## 8 July 2020
-### ATT&CK Spec v1.3.0
+## 8 July 2020 - ATT&CK Spec v1.3.0
 Changes to STIX for July 2020 ATT&CK Content Release (ATT&CK-v7.0)
 
 1. Added sub-techniques:
@@ -50,14 +47,12 @@ Changes to STIX for October 2019 ATT&CK Content Release (ATT&CK-v6.0)
 Changes to STIX for July 2019 ATT&CK Content Release (ATT&CK-v5.0)
 1. Descriptions added to relationships of type `mitigates` under the enterprise domain 
 
-## 30 April 2019
-### ATT&CK Spec v1.2.0
+## 30 April 2019 - ATT&CK Spec v1.2.0
 Changes to STIX for April 2019 ATT&CK Content Release (ATT&CK-v4.0)
 1. `x_mitre_impact_type` added for enterprise techniques within the `Impact` tactic
 2. Descriptions added to relationships between software/groups
 
-## 23 October 2018
-### ATT&CK Spec v1.1.0
+## 23 October 2018 - ATT&CK Spec v1.1.0
 Changes to STIX for October 2018 ATT&CK Content Release (ATT&CK-v3.0)
 
 1. `x_mitre_platforms` added for enterprise malware/tools