Merge pull request #7 from kikutaro/issue6

Fix Response Charset to UTF-8.

Author: thinkingserious

src/main/java/com/sendgrid/Client.java

@@ -326,4 +326,4 @@ public Response api(Request request) throws IOException {
 			throw new IOException(errors.toString());
 		}
 	}
-}
+}

src/main/java/com/sendgrid/SendGridResponseHandler.java

@@ -7,6 +7,7 @@
 import org.apache.http.client.HttpResponseException;
 import org.apache.http.impl.client.AbstractResponseHandler;
 import org.apache.http.util.EntityUtils;
+import java.nio.charset.StandardCharsets;
 
 /**
  * A {@link org.apache.http.client.ResponseHandler} that returns the response body as a String
@@ -34,9 +35,9 @@ public String handleResponse(final HttpResponse response)
         return entity == null ? null : handleEntity(entity);
     }
 
-	@Override
-	public String handleEntity(HttpEntity entity) throws IOException {
-		 return EntityUtils.toString(entity);
-	}
+    @Override
+    public String handleEntity(HttpEntity entity) throws IOException {
+        return EntityUtils.toString(entity, StandardCharsets.UTF_8);
+    }
 
 }