changelog updates for xhr_headers

Author: tdumitrescu

CHANGELOG.md

@@ -1,3 +1,6 @@
+**2.22.1** (22 May 2018)
+- Add `xhr_headers` config option for sending extra headers with each request (thanks @austince)
+
 **2.22.0** (3 May 2018)
 - Add `cookie_prefix` option to GDPR opt-out utils, allowing customization of cookie name
 - Automatically delete user profile and charge data on GDPR opt-out (if specified)

README.md

@@ -68,4 +68,4 @@ In the future we plan to automate the last step with a headless browser to strea
 Mixpanel production releases are tested against a large matrix of browsers and operating systems).
 
 ## Thanks
-For patches and support: @bohanyang, @dehau, @drubin, @D1plo1d, @feychenie, @mogstad, @pfhayes, @sandorfr, @stefansedich, @gfx, @pkaminski
+For patches and support: @bohanyang, @dehau, @drubin, @D1plo1d, @feychenie, @mogstad, @pfhayes, @sandorfr, @stefansedich, @gfx, @pkaminski, @austince