Fixed incorrect example code

Author: snorklerjoe

README.md

@@ -10,7 +10,7 @@ Minimum code to post a temperature value of 32 degrees F every 10 minutes:
 #include <Arduino.h>
 #include <server.h>
 
-CubeServer server();
+CubeServer server;
 
 void setup() {
   server.connect();
@@ -54,7 +54,7 @@ void loop() {
       ``` C++
       #include <Arduino.h>
       #include <server.h>
-      CubeServer server();
+      CubeServer server;
       ```
 
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