Edit changelog and include 1.6.7 release notes.

Author: jxblum

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

@@ -4,6 +4,18 @@ https://github.com/spring-projects/spring-boot-data-geode
 =========================================================
 
 
+Changes in version 1.6.7 (2022-04-21)
+-------------------------------------
+Aligns SBDG with Spring Boot 2.6.7.
+
+* Built on Java 8, JDK 1.8.0_331.
+* Upgrades to Spring Framework 5.3.19.
+* Upgrades to Spring Boot 2.6.7.
+* Upgrades to Spring Data BOM 2021.1.4 (Q-SR4).
+* Upgrades to Spring Data for Apache Geode 2.6.4.
+* Upgrades to Spring Session BOM 2021.1.3.
+
+
 Changes in version 1.5.13 (2022-04-21)
 --------------------------------------
 Aligns SBDG with Spring Boot 2.5.13.