Fix title/sentence case bug

[Adriandmen]

Description

Fixes the ignoring of newlines in the title/sentence case commands. The cause of this is that the regex does not include newlines when using .. This is fixed by adding the dotall-flag (s) to the regex.

Tests have been added as well:

• 05AB1E/test/commands/unary_test.exs

  Line 399 in 7991dbc

  assert evaluate("\"abc\ndef\nghi\"™") == "Abc\nDef\nGhi"

• 05AB1E/test/commands/unary_test.exs

  Line 417 in 7991dbc

  assert evaluate("\"abc. def?\nghi! jkl mnop.\".ª") == "Abc. Def?\nGhi! Jkl mnop."

[codecov]

Codecov Report

Merging #127 into master will not change coverage.
The diff coverage is 100%.

@@           Coverage Diff           @@
##           master     #127   +/-   ##
=======================================
  Coverage   95.88%   95.88%           
=======================================
  Files          17       17           
  Lines        1749     1749           
=======================================
  Hits         1677     1677           
  Misses         72       72

Impacted Files	Coverage Δ
lib/commands/str_commands.ex	92.43% <100%> (ø)	⬆️

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