Fix PIN authorization (#111)

* Use STDIN.gets for pin prompt

* Fix invalid README reference in gemspec

Author: raethlo

lib/twurl/oauth_client.rb

@@ -144,7 +144,7 @@ def client_auth_parameters
     def perform_pin_authorize_workflow
       @request_token = consumer.get_request_token
       CLI.puts("Go to #{generate_authorize_url} and paste in the supplied PIN")
-      pin = gets
+      pin = STDIN.gets
       access_token = @request_token.get_access_token(:oauth_verifier => pin.chomp)
       {:oauth_token => access_token.token, :oauth_token_secret => access_token.secret}
     end

twurl.gemspec

@@ -9,12 +9,12 @@ Gem::Specification.new do |spec|
   spec.description = %q{Curl for the Twitter API}
   spec.email = ['[email protected]']
   spec.executables = `git ls-files -- bin/*`.split("\n").map{ |f| File.basename(f) }
-  spec.extra_rdoc_files = %w(COPYING INSTALL README)
+  spec.extra_rdoc_files = %w(COPYING INSTALL README.md)
   spec.files = `git ls-files -z`.split("\x0").reject { |f| f.start_with?('test/') }
   spec.homepage = 'http://github.com/twitter/twurl'
   spec.licenses = ['MIT']
   spec.name = 'twurl'
-  spec.rdoc_options = ['--title', 'twurl -- OAuth-enabled curl for the Twitter API', '--main', 'README', '--line-numbers', '--inline-source']
+  spec.rdoc_options = ['--title', 'twurl -- OAuth-enabled curl for the Twitter API', '--main', 'README.md', '--line-numbers', '--inline-source']
   spec.require_paths = ['lib']
   spec.required_ruby_version = '>= 2.4.0'
   spec.rubyforge_project = 'twurl'