Edit changelog and add 2.7.0 GA release notes.

Author: jxblum

spring-session-data-geode/src/main/resources/changelog.txt

@@ -4,6 +4,21 @@ https://github.com/spring-projects/spring-session-data-geode
 ============================================================
 
 
+Changes in version 2.7.0 (2022-05-18)
+-------------------------------------
+Aligns Spring Session for Apache Geode (SSDG) with Spring Session (core) 2.7.0 GA.
+
+* Upgrades to Spring Framework 5.3.20.
+* Upgrades to Spring Boot 2.7.0-RC1.
+* Upgrades to Spring Data BOM 2021.2.0.
+* Upgrades to Spring Data Commons 2.7.0.
+* Upgrades to Spring Data for Apache Geode 2.7.0.
+* Upgrades to Spring Security 5.7.0.
+* Upgrades to Spring Session 2.7.0.
+* Upgrades to Spring Test for Apache Geode 0.3.0-RAJ.
+* Upgrades to Mockito 4.5.1.
+
+
 Changes in version 2.7.0-RC1 (2022-04-19)
 -----------------------------------------
 Aligns Spring Session for Apache Geode (SSDG) with Spring Session (core) 2.7.0-RC1.