Add flow module to parent pom

Author: zoewangg

pom.xml

@@ -72,6 +72,7 @@
         <module>test/test-utils</module>
         <module>annotations</module>
         <module>utils</module>
+        <module>flow</module>
     </modules>
     <scm>
         <url>https://github.com/aws/aws-sdk-java-v2.git</url>