README: update bad version bumping for 5.38.0

(encore)

README.os2

@@ -621,7 +621,7 @@ C<set PERLLIB_PREFIX> in F<Config.sys>, see L</"C<PERLLIB_PREFIX>">.
 
 =item Additional Perl modules
 
-  unzip perl_ste.zip -d f:/perllib/lib/site_perl/5.37.12/
+  unzip perl_ste.zip -d f:/perllib/lib/site_perl/5.38.0/
 
 Same remark as above applies.  Additionally, if this directory is not
 one of directories on @INC (and @INC is influenced by C<PERLLIB_PREFIX>), you