Method name fixed according to checkstyle rules

Author: milux

src/main/java/com/amihaiemil/docker/RtVersion.java

@@ -113,7 +113,7 @@ public String minApiVersion() {
      * @return Name of the OS docker is running on
      */
     @Override
-    public String os() {
+    public String osName() {
         return this.getString("Os");
     }
 

src/main/java/com/amihaiemil/docker/Version.java

@@ -36,7 +36,7 @@ public interface Version extends JsonObject {
      * Returns the OS docker is running on.
      * @return Name of the OS docker is running on
      */
-    String os();
+    String osName();
 
     /**
      * Returns the (CPU) architecture docker is running on.

src/test/java/com/amihaiemil/docker/RtVersionTestCase.java

@@ -51,7 +51,7 @@ public final void queryDockerVersion() throws IOException {
         assertEquals("Docker Engine - Community", version.platformName());
         assertEquals("1.40", version.apiVersion());
         assertEquals("1.12", version.minApiVersion());
-        assertEquals("linux", version.os());
+        assertEquals("linux", version.osName());
         assertEquals("amd64", version.arch());
         assertTrue(version.experimental());
     }