remove dots in QA column mapping keys

Author: lhoestq

datasets/cuad/README.md

@@ -30,8 +30,8 @@ train-eval-index:
   col_mapping:
     question: question
     context: context
-    answers.text: answers.text
-    answers.answer_start: answers.answer_start
+    answers_text: answers.text
+    answers_start: answers.answer_start
   metrics:
     - type: cuad
       name: CUAD

datasets/squad/README.md

@@ -30,8 +30,8 @@ train-eval-index:
   col_mapping:
     question: question
     context: context
-    answers.text: answers.text
-    answers.answer_start: answers.answer_start
+    answers_text: answers.text
+    answers_start: answers.answer_start
   metrics:
     - type: squad
       name: SQuAD

datasets/squad_v2/README.md

@@ -30,8 +30,8 @@ train-eval-index:
   col_mapping:
     question: question
     context: context
-    answers.text: answers.text
-    answers.answer_start: answers.answer_start
+    answers_text: answers.text
+    answers_start: answers.answer_start
   metrics:
   - type: squad_v2
     name: SQuAD v2