Update change log.

mitre-attack · Oct 25, 2022 · f52993a · f52993a
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 # Changes to ATT&CK in STIX 2.1
 
+## 25 October 2022 - ATT&CK Spec v3.0.0
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+Changes to ATT&CK in STIX for October 2022 ATT&CK Content Release (ATT&CK v12.0)
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+* Added Campaign objects. For detailed information about the representation of Campaigns in ATT&CK/STIX, please see the campaign section of the [USAGE document](https://github.com/mitre-attack/attack-stix-data/blob/master/USAGE.md#campaigns).
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 ## 21 October 2021 - ATT&CK Spec v2.1.0
 Changes to ATT&CK in STIX for October 2021 ATT&CK Content Release (ATT&CK v10)