Edit changelog and include 1.7.0 release notes.

Author: jxblum

spring-geode-project/spring-geode/src/main/resources/changelog.txt

@@ -4,6 +4,20 @@ https://github.com/spring-projects/spring-boot-data-geode
 =========================================================
 
 
+Changes in version 1.7.0 (2022-05-19)
+-------------------------------------
+Aligns SBDG with Spring Boot 2.7.0
+
+* Built with Java 8, JDK 1.8.0_331.
+* Upgrades to Spring Framework 5.3.20.
+* Upgrades to Spring Boot 2.7.0.
+* Upgrades to Spring Data BOM 2021.2.0 (Raj-GA).
+* Upgrades to Spring Data for Apache Geode 2.7.0.
+* Upgrades to Spring Session BOM 2021.2.0.
+* Upgrades to Spring Session for Apache Geode 2.7.0.
+* Upgrades to Spring Test for Apache Geode 0.3.0-RAJ.
+
+
 Changes in version 1.6.8 (2022-05-19)
 -------------------------------------
 Aligns SBDG with Spring Boot 2.6.8.