Bump version for release

Author: Tom Connors

src/main/java/com/twilio/Twilio.java

@@ -12,7 +12,7 @@
  */
 public class Twilio {
 
-    public static final String VERSION = "7.3.0";
+    public static final String VERSION = "7.4.0";
     public static final String JAVA_VERSION = System.getProperty("java.version");
 
     private static String username;