Update README.md

README.md

@@ -22,6 +22,8 @@ The beta parameter determines the weight of recall in the combined score. beta <
 ## How to Use
 ``` python
 
+import evaluate
+
 fbeta_score = evaluate.load("leslyarun/fbeta_score")
 results = fbeta_score.compute(references=[0, 1], predictions=[0, 1], beta=0.5)
 print(results)