Drop `git ls-files` in gemspec
Drop `git ls-files` in gemspec

Closes: #1353

Signed-off-by: Utkarsh Gupta <9cd038386127f111b1bf6f8180504eb8c2eecd26@debian.org>

biow0lf/shoulda-matchers,biow0lf/shoulda-matchers,biow0lf/shoulda-matchers,thoughtbot/shoulda-matchers,thoughtbot/shoulda-matchers,thoughtbot/shoulda-matchers,thoughtbot/shoulda-matchers,biow0lf/shoulda-matchers