bump endpoints-framework version to 2.0.1 (#515)

Author: tangiel

appengine/endpoints-frameworks-v2/backend/pom.xml

@@ -31,7 +31,7 @@
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 
-        <endpoints.framework.version>2.0.0</endpoints.framework.version>
+        <endpoints.framework.version>2.0.1</endpoints.framework.version>
         <endpoints.management.version>1.0.1</endpoints.management.version>
 
         <endpoints.project.id>YOUR_PROJECT_ID</endpoints.project.id>