Fix several ruby styling issues

Author: alexisbcc

rest/voice/generate-twiml-record/twiml-record.5.x.rb

@@ -20,12 +20,13 @@
 
 get voice_gather do
   redirect voice_endpoint unless %w[1 2].include?(params['Digits'])
-  if params['Digits'] == '1'
+  case params['Digits']
+  when '1'
     response = Twilio::TwiML::Response.new do |r|
       r.Dial '+13105551212'
       r.Say 'The call failed or the remote party hung up. Goodbye.'
     end
-  elsif params['Digits'] == '2'
+  when '2'
     response = Twilio::TwiML::Response.new do |r|
       r.Say 'Record your message after the tone.'
       r.Record maxLength: '30', action: voice_record, method: 'get'

security/signature_validation_tests/signature_validation_tests.5.x.rb

@@ -20,7 +20,7 @@
 # rubocop:disable Metrics/MethodLength
 def test_url(method, url, params, valid)
   if method == 'GET'
-    url += '?' + URI.encode_www_form(params)
+    url += "?#{URI.encode_www_form(params)}"
     params = {}
   end
 

video/rest/compositions/get-composition-media-file/get-composition-media-file.5.x.rb

@@ -19,5 +19,5 @@
 media_location = response.body['redirect_to']
 # For example, write the composition media to a local file
 open('myFile.mp4', 'wb') do |file|
-  file << open(media_location).read
+  file << File.open(media_location).read
 end