Merge pull request #692 from splitrb/dependabot/bundler/rack-test-tw-2.0

Update rack-test requirement from ~> 1.1 to ~> 2.0

Author: andrehjr

split.gemspec

@@ -36,7 +36,7 @@ Gem::Specification.new do |s|
 
   s.add_development_dependency "bundler",     ">= 1.17"
   s.add_development_dependency "simplecov",   "~> 0.15"
-  s.add_development_dependency "rack-test",   "~> 1.1"
+  s.add_development_dependency "rack-test",   "~> 2.0"
   s.add_development_dependency "rake",        "~> 13"
   s.add_development_dependency "rspec",       "~> 3.7"
   s.add_development_dependency "pry",         "~> 0.10"