fix format in POM files

Author: shijiesheng

build.gradle

@@ -231,7 +231,6 @@ publishing {
         maven(MavenPublication) {
             pom.withXml {
                 asNode().with {
-                    appendNode('packaging', 'jar')
                     appendNode('name', 'cadence-client')
                     appendNode('description', description)
                     appendNode('url', 'https://github.com/uber-java/cadence-client')
@@ -246,7 +245,7 @@ publishing {
                         }
                     }
                     appendNode('developers').with {
-                        appendNode('maxim').with {
+                        appendNode('developer').with {
                             appendNode('id', 'maxim')
                             appendNode('name', 'Maxim Fateev')
                             appendNode('email', 'maxim@uber.com')
@@ -314,7 +313,6 @@ uploadArchives {
 
             pom.project {
                 name 'cadence-client'
-                packaging 'jar'
                 // optionally artifactId can be defined here
                 description 'Uber Cadence Java Client'
                 url 'https://github.com/uber-java/cadence-client'