renaming 'set speed' to 'run' (#327)

libs/tests/README.md

@@ -7,8 +7,8 @@ A unit test framework
 Tests are registered as event handlers. They will automatically run once ``on start`` is finished.
 
 ```blocks
-tests.test("lgB set speed 10", () => {
-    motors.largeB.setSpeed(10);
+tests.test("lgB run 10", () => {
+    motors.largeB.run(10);
     pause(100)
     tests.assertClose("speedB", 10, motors.largeB.speed(), 2)
 });