add the support for PUT

Author: Anthony Roux

src/main/java/com/amadeus/Constants.java

@@ -11,6 +11,8 @@ public final class Constants {
   // HTTP verbs
   public static final String GET = "GET";
   public static final String POST = "POST";
+  public static final String PUT = "PUT";
+
 
   public static final String HTTPS = "https";
   public static final String HTTP = "http";

src/main/java/com/amadeus/Request.java

@@ -106,7 +106,7 @@ protected void establishConnection() throws IOException {
     this.connection = (HttpURLConnection) new URL(uri).openConnection();
     connection.setRequestMethod(verb);
     connection.setDoInput(true);
-    if (verb == Constants.POST) {
+    if (verb == Constants.POST || verb == Constants.PUT) {
       connection.setDoOutput(true);
     }
     for (Map.Entry<String, String> entry : headers.entrySet()) {