chore: Remove unnecessary require statements

lib/sendgrid/helpers/mail/asm.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class ASM
     def initialize(group_id: nil, groups_to_display: nil)

lib/sendgrid/helpers/mail/attachment.rb

@@ -1,4 +1,3 @@
-require 'json'
 require 'base64'
 
 module SendGrid

lib/sendgrid/helpers/mail/bcc_settings.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class BccSettings
     def initialize(enable: nil, email: nil)

lib/sendgrid/helpers/mail/bypass_list_management.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class BypassListManagement
     def initialize(enable: nil)

lib/sendgrid/helpers/mail/category.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Category
     attr_accessor :name

lib/sendgrid/helpers/mail/click_tracking.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class ClickTracking
     def initialize(enable: nil, enable_text: nil)

lib/sendgrid/helpers/mail/content.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Content
 

lib/sendgrid/helpers/mail/custom_arg.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class CustomArg
     def initialize(key: nil, value: nil)

lib/sendgrid/helpers/mail/email.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Email
 

lib/sendgrid/helpers/mail/footer.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Footer
     def initialize(enable: nil, text: nil, html: nil)

lib/sendgrid/helpers/mail/ganalytics.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Ganalytics
     def initialize(enable: nil, utm_source: nil, utm_medium: nil, utm_term: nil, utm_content: nil, utm_campaign: nil, utm_name: nil)
@@ -71,4 +69,4 @@ def to_json(*)
       }.delete_if { |_, value| value.to_s.strip == '' }
     end
   end
-end
+end

lib/sendgrid/helpers/mail/header.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Header
     def initialize(key: nil, value: nil)

lib/sendgrid/helpers/mail/mail.rb

@@ -1,7 +1,5 @@
 # Build the request body for the v3/mail/send endpoint
 # Please see the examples/helpers/mail/example.rb for a demonstration of usage
-require 'json'
-
 module SendGrid
   class Mail
 

lib/sendgrid/helpers/mail/mail_settings.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class MailSettings
     def initialize

lib/sendgrid/helpers/mail/open_tracking.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class OpenTracking
     def initialize(enable: nil, substitution_tag: nil)

lib/sendgrid/helpers/mail/personalization.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Personalization
 

lib/sendgrid/helpers/mail/section.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Section
     def initialize(key: nil, value: nil)

lib/sendgrid/helpers/mail/spam_check.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class SpamCheck
     def initialize(enable: nil, threshold: nil, post_to_url: nil)

lib/sendgrid/helpers/mail/subscription_tracking.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class SubscriptionTracking
     def initialize(enable: nil, text: nil, html: nil, substitution_tag: nil)

lib/sendgrid/helpers/mail/substitution.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Substitution
     def initialize(key: nil, value: nil)

lib/sendgrid/helpers/mail/tracking_settings.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class TrackingSettings
     def initialize

lib/sendgrid/helpers/stats/metrics.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class Metrics
     attr_reader :blocks, :bounce_drops,

lib/sendgrid/helpers/stats/stats_response.rb

@@ -1,5 +1,3 @@
-require 'json'
-
 module SendGrid
   class StatsResponse
     def initialize(args)