Update debug logging in documentation; add changelog entry

CHANGELOG.md

@@ -18,6 +18,7 @@ and [Keep a Changelog](http://keepachangelog.com/).
 ### Changed
 
 - Centralized API communication checks in `WikiPage::request()` ([#136])
+- Centralized debug logging of API requests/responses in `WikiPage::request()` ([#139])
 - Added additional context to `README.md` ([#127])
 - Added semi-linear merge recommendation to `GOVERNANCE.md` ([#130])
 
@@ -211,3 +212,4 @@ and may require changes in applications that invoke these methods:_
 [#135]: https://github.com/hamstar/Wikimate/pull/135
 [#136]: https://github.com/hamstar/Wikimate/pull/136
 [#138]: https://github.com/hamstar/Wikimate/pull/138
+[#139]: https://github.com/hamstar/Wikimate/pull/139

README.md

@@ -66,7 +66,8 @@ You should get a meaningful error message if the authentication fails.
 
 Instead of using echo statements, you can enable/disable debugging
 with the `$wiki->debugMode($boolean)` method.
-Currently only output from the logon process is printed for debugging.
+Debug logging is printed to [standard output](https://en.wikipedia.org/wiki/Standard_output)
+and includes API requests/responses as well as retry messages for lag errors.
 
 Assuming you were able to log in, you're now ready to fully use the API.
 

USAGE.md

@@ -47,7 +47,8 @@ You should get a meaningful error message if the authentication fails.
 
 Instead of using echo statements, you can enable/disable debugging
 with the `$wiki->debugMode($boolean)` method.
-Currently only output from the logon process is printed for debugging.
+Debug logging is printed to [standard output](https://en.wikipedia.org/wiki/Standard_output)
+and includes API requests/responses as well as retry messages for lag errors.
 
 Assuming you were able to log in, you're now ready to fully use the API.
 The next sections provide example code for several common tasks.