chore: update license references

Author: Sam Harrison

README.md

@@ -3,7 +3,7 @@
 [![BuildStatus](https://travis-ci.org/sendgrid/ruby-http-client.svg?branch=main)](https://travis-ci.org/sendgrid/ruby-http-client)
 [![Email Notifications Badge](https://dx.sendgrid.com/badge/ruby)](https://dx.sendgrid.com/newsletter/ruby)
 [![Gem Version](https://badge.fury.io/rb/ruby_http_client.svg)](https://badge.fury.io/rb/ruby_http_client)
-[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](./LICENSE.md)
+[![MIT licensed](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)
 [![Twitter Follow](https://img.shields.io/twitter/follow/sendgrid.svg?style=social&label=Follow)](https://twitter.com/sendgrid)
 [![GitHub contributors](https://img.shields.io/github/contributors/sendgrid/ruby-http-client.svg)](https://github.com/sendgrid/ruby-http-client/graphs/contributors)
 
@@ -108,4 +108,4 @@ If you need help installing or using the library, please check the [Twilio SendG
 If you've instead found a bug in the library or would like new features added, go ahead and open issues or pull requests against this repo!
 
 # License
-[The MIT License (MIT)](LICENSE.md)
+[The MIT License (MIT)](LICENSE)

test/test_ruby_http_client.rb

@@ -373,7 +373,7 @@ def test_issue_template_exists
   end
 
   def test_license_exists
-    assert(File.file?('./LICENSE.md') || File.file?('./LICENSE.txt'))
+    assert(File.file?('./LICENSE'))
   end
 
   def test_pull_request_template_exists
@@ -393,7 +393,7 @@ def test_use_cases_exists
   end
 
   def test_license_date_is_updated
-    license_end_year = IO.read('LICENSE.md').match(/Copyright \(C\) (\d{4}), Twilio SendGrid/)[1].to_i
+    license_end_year = IO.read('LICENSE').match(/Copyright \(C\) (\d{4}), Twilio SendGrid/)[1].to_i
     current_year = Time.new.year
     assert_equal(current_year, license_end_year)
   end