Actualize gemspec homepage URI

Author: AlexWayfer

grape-swagger-representable.gemspec

@@ -9,7 +9,7 @@ Gem::Specification.new do |s|
   s.email         = ['[email protected]']
 
   s.summary       = 'Grape swagger adapter to support representable object parsing'
-  s.homepage      = 'https://github.com/Bugagazavr/grape-swagger-representable'
+  s.homepage      = 'https://github.com/ruby-grape/grape-swagger-representable'
   s.license       = 'MIT'
 
   s.files         = `git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }