update docker plugin to 1.2.2 for fixing error in building image in w…

…indows 10 as related here: spotify/docker-maven-plugin#351

pom.xml

@@ -38,7 +38,7 @@
         <docker.image.exposed.port>9090</docker.image.exposed.port>
         <docker.image.dockerfile.dir>${basedir}</docker.image.dockerfile.dir>
         <docker.image.dockerize.version>v0.6.1</docker.image.dockerize.version>
-        <docker.plugin.version>1.2.0</docker.plugin.version>
+        <docker.plugin.version>1.2.2</docker.plugin.version>
     </properties>
 
     <dependencyManagement>