Update swagger annotation version in Java clients (#915)

* update swagger annotation version in java client

* add java retrofit2 play 2.6 to java petstore all bin script

* remove empty line in pom.xml

samples/client/petstore/java/jersey2-java6/build.sbt

@@ -9,7 +9,7 @@ lazy val root = (project in file(".")).
     publishArtifact in (Compile, packageDoc) := false,
     resolvers += Resolver.mavenLocal,
     libraryDependencies ++= Seq(
-      "io.swagger" % "swagger-annotations" % "1.5.20",
+      "io.swagger" % "swagger-annotations" % "1.5.21",
       "org.glassfish.jersey.core" % "jersey-client" % "2.6",
       "org.glassfish.jersey.media" % "jersey-media-multipart" % "2.6",
       "org.glassfish.jersey.media" % "jersey-media-json-jackson" % "2.6",

samples/client/petstore/java/jersey2-java6/pom.xml

@@ -114,8 +114,7 @@
                         </goals>
                         <configuration>
                             <sources>
-                                <source>
-                                src/main/java</source>
+                                <source>src/main/java</source>
                             </sources>
                         </configuration>
                     </execution>
@@ -127,8 +126,7 @@
                         </goals>
                         <configuration>
                             <sources>
-                                <source>
-                                src/test/java</source>
+                                <source>src/test/java</source>
                             </sources>
                         </configuration>
                     </execution>
@@ -200,7 +198,7 @@
         <dependency>
             <groupId>io.swagger</groupId>
             <artifactId>swagger-annotations</artifactId>
-            <version>${swagger-core-version}</version>
+            <version>${swagger-annotations-version}</version>
         </dependency>
 
         <!-- HTTP client: jersey-client -->
@@ -267,7 +265,7 @@
     </dependencies>
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <swagger-core-version>1.5.20</swagger-core-version>
+        <swagger-annotations-version>1.5.21</swagger-annotations-version>
         <jersey-version>2.6</jersey-version>
         <commons_io_version>2.5</commons_io_version>
         <commons_lang3_version>3.6</commons_lang3_version>