upgrade bundler dependecy

Author: sanzmauro

splitclient-rb.gemspec

@@ -38,7 +38,7 @@ Gem::Specification.new do |spec|
 
   spec.add_development_dependency 'allocation_stats'
   spec.add_development_dependency 'appraisal'
-  spec.add_development_dependency 'bundler', '~> 1.11'
+  spec.add_development_dependency 'bundler'
   spec.add_development_dependency 'pry'
   spec.add_development_dependency 'pry-nav'
   spec.add_development_dependency 'rake', '12.3.3'