Remove flow as a module

Author: dagnir

pom.xml

@@ -70,7 +70,6 @@
         <module>test/test-utils</module>
         <module>test/codegen-generated-classes-test</module>
         <module>utils</module>
-        <module>flow</module>
     </modules>
     <scm>
         <url>https://github.com/aws/aws-sdk-java-v2.git</url>