Revert to snapshots and add whats new

README.md

@@ -187,7 +187,7 @@ If you’re a Maven user, you can use the dependencies by adding the following t
         <dependency>
             <groupId>org.springframework.grpc</groupId>
             <artifactId>spring-grpc-dependencies</artifactId>
-            <version>0.3.0</version>
+            <version>0.4.0-SNAPSHOT</version>
             <type>pom</type>
             <scope>import</scope>
         </dependency>
@@ -201,7 +201,7 @@ As shown in the snippet below this can then be followed by version-less declarat
 
 ```gradle
 dependencies {
-  implementation platform("org.springframework.grpc:spring-grpc-dependencies:0.3.0")
+  implementation platform("org.springframework.grpc:spring-grpc-dependencies:0.4.0-SNAPSHOT")
 }
 ```