Allow JWT gem 2.0 since 1.0 is very outdated

Author: jayelkaake

bigcommerce.gemspec

@@ -23,5 +23,5 @@ Gem::Specification.new do |s|
   s.add_dependency 'faraday', '~> 0.11'
   s.add_dependency 'faraday_middleware', '~> 0.11'
   s.add_dependency 'hashie', '~> 3.4'
-  s.add_dependency 'jwt', '~> 1.5.4'
+  s.add_dependency 'jwt', '>= 1.5.4', '< 3'
 end