Update version to 1.2.0 and add authors.

Author: awickert

CITATION.cff

@@ -6,11 +6,15 @@ authors:
   orcid: "https://orcid.org/0000-0003-2150-6935"
 - family-names: "Wickert"
   given-names: "Andrew D."
+- family-names: "Nürnberg"
+  given-names: "Jacob"
+- family-names: "Sparks"
+  given-names: "David G."
   orcid: "https://orcid.org/0000-0002-9545-3365"
 - family-names: "Open-Source Hardware Community"
   given-names: "Global"
 title: "DS3231"
-version: 1.1.1
+version: 1.2.0
 doi: 10.5281/zenodo.2008621
 date-released: 2022-08-08
 url: "https://github.com/NorthernWidget/DS3231"