Remove .RELEASE suffix from version number in documentation.

Closes #546

Author: dzou

README.adoc

@@ -80,7 +80,7 @@ Add the Maven dependency:
 <dependency>
   <groupId>org.springframework.data</groupId>
   <artifactId>spring-data-r2dbc</artifactId>
-  <version>${version}.RELEASE</version>
+  <version>${version}</version>
 </dependency>
 ----