Revert ".travis.yml: install Types-Bool for testing PR"

This reverts commit 9b250b6.

Author: aferreira

.travis.yml

@@ -43,7 +43,6 @@ install:
   - export AUTOMATED_TESTING=1 HARNESS_TIMER=1
   - cpan-install --deps       # installs prereqs, including recommends
   - cpan-install JSON JSON::PP JSON::XS Mojo::JSON Test::LeakTrace Time::Piece
-  - cpan-install FERREIRA/Types-Bool-2.98003-TRIAL.tar.gz
   - test x$AUTHOR_TESTING = x1 && cpan-install Test::CPAN::Meta Test::MinimumVersion
         Pod::Spell::CommonMistakes Class::XSAccessor Test::Kwalitee Test::Spelling
         Text::CSV_XS Test::Pod Test::Pod::Coverage