Update QA_Tensorflow.py

QA_Tensorflow.py

@@ -60,4 +60,4 @@ def question_answering_tf(question, context):
     #Return characters from context corresponding to start and end of token characters 
     start_char, _ = offset_mapping[offset_index][start_token]
     _, end_char = offset_mapping[offset_index][end_token]
-    return context[start_char:end_char+1]
+    return context[start_char:end_char]