[docs] Fix two URLs

Author: zuo

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file. The
 format is based (to a large extent) on [Keep a Changelog](https://keepachangelog.com/).
 
 This project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
-The entire *public API* is documented in the [API Reference](https://certlib-log.readthedocs.io/reference/)
+The entire *public API* is documented in the [API Reference](https://certlib-log.readthedocs.io/en/latest/reference/)
 (with the proviso that *neither* any exception messages *nor* any source
 code available there via the `<> Source code...` elements are part of the
 *public API*).

README.md

@@ -127,7 +127,7 @@ def example_with_no_text(temperature, pressure, debug_data_dict, calm=True):
     logger.debug(xm(debug_data_dict))
 ```
 
-You can find more examples in the [User's Guide](https://certlib-log.readthedocs.io/guide/).
+You can find more examples in the [User's Guide](https://certlib-log.readthedocs.io/en/latest/guide/).
 
 
 ## Copyright and License