fix: Regional API domain processing

Author: manisha1997

lib/twilio-ruby/base/client_base.rb

@@ -34,12 +34,12 @@ def initialize(username = nil, password = nil, account_sid = nil, region = nil,
       end
 
       def edge=(value)
-        warn "[DEPRECATION] `edge` is deprecated and will be removed in a future version. Use `region` instead."
+        warn '[DEPRECATION] `edge` is deprecated and will be removed in a future version. Use `region` instead.'
         @edge = value
       end
 
       def edge
-        warn "[DEPRECATION] `edge` is deprecated and will be removed in a future version. Use `region` instead."
+        warn '[DEPRECATION] `edge` is deprecated and will be removed in a future version. Use `region` instead.'
         @edge
       end