urandom: Move example to Move Hub.

Move it do a dedicated example instead of hardcoding it in the module docstring.

Also update changelog for missing previous changes while we are at it.

examples/pup/hub_movehub/randint_implementation.py

@@ -0,0 +1,19 @@
+from pybricks.hubs import MoveHub
+
+# Initialize the hub.
+hub = MoveHub()
+
+# Initialize "random" seed.
+_rand = hub.battery.voltage() + hub.battery.current()
+
+
+# Return a random integer N such that a <= N <= b.
+def randint(a, b):
+    global _rand
+    _rand = 75 * _rand % 65537  # Lehmer
+    return _rand * (b - a + 1) // 65537 + a
+
+
+# Generate a few example numbers.
+for i in range(5):
+    print(randint(0, 1000))