updated @Given clause for the calculatorsteps test class for matching...

updated @Given clause for the calculatorsteps test class for matching calculatorTests.feature patterns

src/test/java/hellocucumber/CalculatorSteps.java

@@ -11,7 +11,7 @@ public class CalculatorSteps {
     Calculator calculator;
     Integer result;
 
-    @Given("^I have a calculator$")
+    @Given("I have a calculator")
     public void generateCalculator() {
         this.calculator = new Calculator();
     }