Remove unused constant

Author: ahx

README.md

@@ -332,8 +332,6 @@ Here is a [feature comparison between openapi_first and committee](https://gist.
 
 ### How can I adapt request paths that don't match my schema?
 
-If your API is deployed at a different path than what's defined in your OpenAPI schema, you can use `env[OpenapiFirst::PATH]` to override the path used for schema matching.
-
 Let's say you have `openapi.yaml` like this:
 
 ```yaml

lib/openapi_first.rb

@@ -16,9 +16,6 @@ module OpenapiFirst
   # Key in rack to find instance of Request
   REQUEST = 'openapi.request'
 
-  # Key in rack to store the alternate path used for schema matching
-  PATH = 'openapi.path'
-
   FAILURE = :openapi_first_validation_failure
 
   # @return [Configuration]