fix: wizard goToStep boundary

Author: devrnt

src/wizard.tsx

@@ -30,7 +30,7 @@ const Wizard: React.FC<WizardProps> = React.memo(
 
     const goToStep = React.useRef((stepIndex: number) => {
       if (
-        stepIndex > 0 &&
+        stepIndex >= 0 &&
         stepIndex < React.Children.toArray(children).length
       ) {
         setActiveStep(stepIndex);

test/useWizard.test.tsx

@@ -122,6 +122,18 @@ describe('useWizard', () => {
     expect(result.current.isLastStep).toBe(true);
   });
 
+  test('should go to given step index', async () => {
+    const { result } = renderUseWizardHook(1);
+
+    act(() => {
+      result.current.goToStep(0);
+    });
+
+    expect(result.current.activeStep).toBe(0);
+    expect(result.current.isFirstStep).toBe(true);
+    expect(result.current.isLastStep).toBe(false);
+  });
+
   test('should go to given step index and not invoke `handleStep` handler', async () => {
     const handler = jest.fn();
     const { result } = renderUseWizardHook();