Fix display test for BigFloat newest julia versions

[Kolaru]

This PR add a version check in the tests so that we follow the change of display of BigFloat exponent.

Solve the failing test in nightly.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.28%. Comparing base (31bfb51) to head (f582f7b).
Report is 10 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #722      +/-   ##
==========================================
+ Coverage   78.02%   78.28%   +0.26%     
==========================================
  Files          30       30              
  Lines        2930     2933       +3     
==========================================
+ Hits         2286     2296      +10     
+ Misses        644      637       -7     

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