Fix dependency declaration to work with BE 2.5

Author: RobinDaugherty

Diff for: better_errors-pry.gemspec

@@ -27,7 +27,7 @@ Gem::Specification.new do |spec|
   spec.add_development_dependency "rake", "~> 10.0"
   spec.add_development_dependency "rspec", "~> 3.0"
 
-  spec.add_dependency "better_errors", '~> 2.3.0', '>= 2.3.0'
+  spec.add_dependency "better_errors", '~> 2.3', '>= 2.3.0'
   spec.add_dependency "pry", ">= 0.9"
   spec.add_dependency "binding_of_caller"
 end