small README.md fix

Author: Bob Bui

README.md

@@ -11,7 +11,7 @@ If you're using Cloud Foundry, it might worth to check out the library [SAP/cf-p
    2.4 [Log extra properties](#24-log-extra-properties)  
    2.5 [Root logger](#25-root-logger)  
    2.6 [Custom log formatter](#26-custom-log-formatter)  
-   2.7 [Exclude certain URl from request instrumentation](#27-exclude-certain-url-from-request-instrumentation)
+   2.7 [Exclude certain URL from request instrumentation](#27-exclude-certain-url-from-request-instrumentation)
 3. [Configuration](#3-configuration)  
 4. [Python References](#4-python-references)
 5. [Framework support plugin development](#5-framework-support-plugin-development)