Edit changelog and add 1.3.11.RELEASE notes.

Author: jxblum

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

@@ -4,6 +4,18 @@ https://github.com/spring-projects/spring-boot-data-geode
 ==============================================================
 
 
+Changes in version 1.3.11.RELEASE (2021-05-20)
+----------------------------------------------
+Aligns SBDG with Spring Boot 2.3.11.RELEASE along with the latest versions of Spring Framework, Spring Data,
+Spring Session and Spring Test for Apache Geode.
+
+* Upgrades to Byte Buddy 1.11.0.
+* Upgrades to Mockito 3.10.0.
+* Upgrades to VMware Tanzu GemFire for VMS (Pivotal Cloud Cache) 1.12.2.
+* Upgrades to Spring Framework 5.2.15.RELEASE.
+* Upgrades to Spring Boot 2.3.11.RELEASE.
+
+
 Changes in version 1.3.10.RELEASE (2021-04-28)
 ----------------------------------------------
 Aligns SBDG with Spring Boot 2.3.10.RELEASE along with the latest versions of Spring Framework, Spring Data,