Merge pull request #34 from robinst/fix-maven-warnings

Fix maven warnings about versions and encoding

pom.xml

@@ -10,6 +10,7 @@
   <url>https://github.com/DataDog/java-dogstatsd-client</url>
 
   <properties>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
     <java.version>1.6</java.version>
   </properties>
 
@@ -96,6 +97,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.6.1</version>
         <configuration>
           <source>1.6</source>
           <target>1.6</target>
@@ -104,6 +106,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
+        <version>2.10.4</version>
         <executions>
           <execution>
             <id>attach-javadocs</id>
@@ -116,6 +119,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-gpg-plugin</artifactId>
+        <version>1.6</version>
         <executions>
           <execution>
             <id>sign-artifacts</id>
@@ -129,7 +133,7 @@
       <plugin>
         <groupId>org.sonatype.plugins</groupId>
         <artifactId>nexus-staging-maven-plugin</artifactId>
-        <version>1.6.3</version>
+        <version>1.6.8</version>
         <extensions>true</extensions>
         <configuration>
           <serverId>ossrh</serverId>