Regenerate gemspec for version 0.15.9
Regenerate gemspec for version 0.15.9

edmundhighcock/coderunner,edmundhighcock/coderunner,edmundhighcock/coderunner,coderunner-framework/coderunner,coderunner-framework/coderunner,coderunner-framework/coderunner,coderunner-framework/coderunner