Prep for 0.3.0 release

Author: dmhendricks

README.md

@@ -47,6 +47,4 @@ Release changes are be noted on the [Releases](https://github.com/dmhendricks/wo
 
 #### Branch: `master`
 
-* Added `is_ajax()` method
-* Updated Composer license to conform to new SPDX identifiers
-* Added [phpdotenv](https://github.com/etelford/phpdotenv) support ([reference](https://github.com/dmhendricks/wordpress-toolkit/wiki/ToolKit#environment))
+* None since release