Fix stray error return in WikiPage::setText(); add changelog entry

CHANGELOG.md

@@ -10,6 +10,11 @@ and [Keep a Changelog](http://keepachangelog.com/).
 * Added additional context to README.md ([#127])
 * Added semi-linear merge recommendation to GOVERNANCE.md ([#130])
 
+_The following entry is a backwards incompatible API change
+and may require changes in applications that invoke these methods:_
+
+* Error return values for `WikiPage::getSection()` changed from `false` to `null`, and for `setText()` from `null` to `false` ([#129])
+
 #### Removed
 
 * Method `Wikimate::debugCurlConfig()`, deprecated since v0.10.0 ([#128])
@@ -169,4 +174,5 @@ and [Keep a Changelog](http://keepachangelog.com/).
 [#125]: https://github.com/hamstar/Wikimate/pull/125
 [#127]: https://github.com/hamstar/Wikimate/pull/127
 [#128]: https://github.com/hamstar/Wikimate/pull/128
+[#129]: https://github.com/hamstar/Wikimate/pull/129
 [#130]: https://github.com/hamstar/Wikimate/pull/130

Wikimate.php

@@ -1308,7 +1308,7 @@ public function setText($text, $section = null, $minor = false, $summary = null)
 			// Check for errors
 			if (isset($r['error'])) {
 				$this->error = $r['error']; // Set the error if there was one
-				return null;
+				return false;
 			} else {
 				$this->error = null; // Reset the error status
 			}