Added missing colon at function head for turtle_go

02_IntroductionToROS/README.md

@@ -157,7 +157,7 @@ Inside the package *exercise_1* we will now create a `node` that **publishes** `
     import rospy
     from geometry_msgs.msg import Twist
 
-    def turtle_go()
+    def turtle_go():
         pub = rospy.Publisher('/turtle1/cmd_vel', Twist, queue_size=10)
         rospy.init_node('turtle_go', anonymous=True)
         rate = rospy.Rate(10) # 10Hz