Remove bug tracker from gemspec

Author: andrew

split-analytics.gemspec

@@ -7,7 +7,6 @@ Gem::Specification.new do |gem|
   gem.email         = ['andrewnez@gmail.com']
   gem.summary       = 'Split extension to push test data to Google Analytics'
   gem.homepage      = 'https://github.com/splitrb/split-analytics'
-  gem.bug_tracker_uri      = 'https://github.com/splitrb/split-analytics/issues'
   gem.license       = 'MIT'
 
   gem.executables   = `git ls-files -- bin/*`.split("\n").map { |f| File.basename(f) }