Ignore prompt_toolkit v1 import in coverage report

Author: danilobellini

axelrod/strategies/human.py

@@ -5,7 +5,7 @@
 from prompt_toolkit import prompt
 from prompt_toolkit.validation import ValidationError, Validator
 
-try:  # prompt_toolkit v1
+try:  # pragma: no cover
     from prompt_toolkit.styles import style_from_dict
     from prompt_toolkit.token import Token