Update POM version numbers for Apache Commons Pool release 2.9.0
diff --git a/pom.xml b/pom.xml
index ebc28d5..566c791 100644
--- a/pom.xml
+++ b/pom.xml
@@ -28,7 +28,7 @@
   </parent>
 
   <artifactId>commons-pool2</artifactId>
-  <version>2.9.0-SNAPSHOT</version>
+  <version>2.9.0</version>
   <name>Apache Commons Pool</name>
 
   <inceptionYear>2001</inceptionYear>