Edit changelog and include 1.5.13 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 1.5.13 (2022-04-21)
+--------------------------------------
+Aligns SBDG with Spring Boot 2.5.13.
+
+* Built on Java 8, JDK 1.8.0_331.
+* Upgrades to Spring Framework 5.3.19.
+* Upgrades to Spring Boot 2.5.13.
+* Upgrades to Spring Data BOM 2021.0.11 (Pascal-SR11).
+* Upgrades to Spring Data for Apache Geode 2.5.11.
+* Upgrades to Spring Session BOM 2021.0.6
+
+
 Changes in version 1.6.6 (2022-03-31)
 --------------------------------------
 Aligns SBDG with Spring Boot 2.6.6.