Update WordMorph

- Ensure length of each step is correct
- Add WordMorph to plugin_autoload

data/plugin_autoload

@@ -20,4 +20,5 @@ TypoSub
 UrlTitles
 Weather
 Wolfram
+WordMorph
 Wttr

lib/PBot/Plugin/WordMorph.pm

@@ -212,7 +212,7 @@ sub wordmorph {
                     return "I do not know this word `$word`.";
                 }
 
-                if (distance($word, $last_word) != 1) {
+                if (distance($word, $last_word) != 1 || length($word) != length($last_word)) {
                     return "Wrong. `$word` does not follow from `$last_word`.";
                 }
 

lib/PBot/VERSION.pm

@@ -25,7 +25,7 @@ use PBot::Imports;
 # These are set by the /misc/update_version script
 use constant {
     BUILD_NAME     => "PBot",
-    BUILD_REVISION => 4576,
+    BUILD_REVISION => 4577,
     BUILD_DATE     => "2022-08-26",
 };