keep_up.gemspec in keep_up-0.7.0 vs keep_up.gemspec in keep_up-0.7.1

@@ -24,10 +24,10 @@
   spec.executables   = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
   spec.required_ruby_version = '>= 2.3.0'
 
-  spec.add_runtime_dependency 'bundler', '~> 1.15'
+  spec.add_runtime_dependency 'bundler', ['>= 1.15', '< 3.0']
 
   spec.add_development_dependency 'aruba', '~> 0.14.2'
   spec.add_development_dependency 'rake', '~> 12.0'
   spec.add_development_dependency 'rspec', '~> 3.0'
   spec.add_development_dependency 'simplecov', '~> 0.16.1'