Lock well known dependencies

Author: Jade Ornelas Figueroa

lib/payola/version.rb

@@ -1,3 +1,3 @@
 module Payola
-  VERSION = '1.5.1'.freeze
+  VERSION = '1.6.0'.freeze
 end

payola.gemspec

@@ -16,16 +16,16 @@ Gem::Specification.new do |s|
     f.match(%r{^(test|spec|features)/})
   end
 
-  s.add_dependency "rails", ">= 4.1"
+  s.add_dependency "rails", ">= 5.2"
   s.add_dependency "jquery-rails"
-  s.add_dependency "stripe", ">= 1.20.1"
+  s.add_dependency "stripe", "~> 1.0"
   s.add_dependency "aasm", ">= 4.0.7"
-  s.add_dependency "stripe_event", ">= 1.3.0"
+  s.add_dependency "stripe_event", ">= 1.3.0", "< 2"
 
   s.add_development_dependency "sqlite3"
   s.add_development_dependency "rspec-rails"
   s.add_development_dependency "factory_girl_rails"
-  s.add_development_dependency "stripe-ruby-mock", ">= 2.3.1"
+  s.add_development_dependency "stripe-ruby-mock", "~> 2.4"
   s.add_development_dependency "sucker_punch", "~> 1.2.1"
   s.add_development_dependency "docverter"
 end