Edit changelog and add 2.0.0-M3 release notes.

Author: jxblum

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

@@ -4,6 +4,21 @@ https://github.com/spring-projects/spring-boot-data-geode
 =========================================================
 
 
+Changes in version 2.0.0-M3 (2022-05-19)
+----------------------------------------
+Aligns SBDG with Spring Boot 3.0.0-M3.
+
+* Built with Java 17, JDK 17+35-LTS-2724 (2021-09-14 LTS).
+* Upgrades to Spring Framework 6.0.0-M4
+* Upgrades to Spring Boot 3.0.0-M3.
+* Upgrades to Spring Cloud Bindings 1.9.0.
+* Upgrades to Spring Data BOM 2022.0.0-M4 (Raj-GA).
+* Upgrades to Spring Data for Apache Geode 3.0.0-M4.
+* Upgrades to Spring Session BOM 2022.0.0-M2.
+* Upgrades to Spring Session for Apache Geode 3.0.0-M3.
+* Upgrades to Spring Test for Apache Geode 1.0.0-M4.
+
+
 Changes in version 1.7.0 (2022-05-19)
 -------------------------------------
 Aligns SBDG with Spring Boot 2.7.0