tfw.gemspec in tfw-0.1.17 vs tfw.gemspec in tfw-0.1.18

@@ -35,10 +35,10 @@
   spec.executables   = spec.files.grep(%r{^exe/}) { |f| File.basename(f) }
   spec.require_paths = ['lib']
 
   spec.add_dependency 'tfdsl', '0.1.11'
 
-  spec.add_development_dependency 'bundler', '~> 1.17'
+  spec.add_development_dependency 'bundler', '~> 2.1'
   spec.add_development_dependency 'coveralls', '~> 0.8'
   spec.add_development_dependency 'minitest', '~> 5.0'
   spec.add_development_dependency 'pry', '~> 0.12'
   spec.add_development_dependency 'rake', '~> 13.0'
   spec.add_development_dependency 'rubocop', '~> 0.79'