Update t.jl

[itsdebartha]

Add a test for confint with an invalid tail specification

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.81%. Comparing base (e03407a) to head (395d41c). Report is 122 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #284      +/-   ##
==========================================
+ Coverage   90.04%   93.81%   +3.76%     
==========================================
  Files          28       28              
  Lines        1467     1730     +263     
==========================================
+ Hits         1321     1623     +302     
+ Misses        146      107      -39     

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