pdd.gemspec in pdd-0.20.7 vs pdd.gemspec in pdd-0.20.8

@@ -18,21 +18,22 @@
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 # SOFTWARE.
 
 require 'English'
 
-lib = File.expand_path('../lib', __FILE__)
+lib = File.expand_path('lib', __dir__)
 $LOAD_PATH.unshift(lib) unless $LOAD_PATH.include?(lib)
 require_relative 'lib/pdd/version'
 
 Gem::Specification.new do |s|
   s.specification_version = 2 if s.respond_to? :specification_version=
   if s.respond_to? :required_rubygems_version=
-    s.required_rubygems_version = Gem::Requirement.new('>= 0')
+    s.required_rubygems_version =
+      Gem::Requirement.new('>= 0')
   end
   s.rubygems_version = '2.3'
-  s.required_ruby_version = '>= 2.3'
+  s.required_ruby_version = '~> 2.3'
   s.name = 'pdd'
   s.version = PDD::VERSION
   s.license = 'MIT'
   s.summary = 'Puzzle Driven Development collector'
   s.description = 'Collects PDD puzzles from a source code base'
@@ -54,7 +55,8 @@
   s.add_development_dependency 'rake', '12.0.0'
   s.add_development_dependency 'rdoc', '4.2.0'
   s.add_development_dependency 'rspec-rails', '3.1.0'
   s.add_development_dependency 'rubocop', '0.52.1'
   s.add_development_dependency 'rubocop-rspec', '1.15.1'
+  s.add_development_dependency 'slop', '4.9.1'
   s.add_development_dependency 'xcop', '0.5.8'
 end