fixed: tests: TestGitChangelog#test_changelog_last fails after b09605603f378f913f2fbd00477016e6814808b5
fixed: tests: TestGitChangelog#test_changelog_last fails after b09605603f378f913f2fbd00477016e6814808b5

b096056 (fixed: Rake::GitChangelog: changelog is not generated when
:since is not set, 2014-10-20) introduces a failure in tests.

ashumkin/rake-delphi,ashumkin/rake-delphi,ashumkin/rake-delphi