[cleanup] Remove desupported site.getExpandedString

Change-Id: I9a03eef10f63dacfaff7fbc610cf0953b848276a
---
M pywikibot/site/__init__.py
1 file changed, 0 insertions(+), 6 deletions(-)

diff --git a/pywikibot/site/__init__.py b/pywikibot/site/__init__.py
index 5052e02..eb14b0e 100644
--- a/pywikibot/site/__init__.py
+++ b/pywikibot/site/__init__.py
@@ -2390,12 +2390,6 @@
             key = '*'
         return req.submit()['expandtemplates'][key]
 
-    getExpandedString = redirect_func(expand_text,
-                                      old_name='getExpandedString',
-                                      class_name='APISite',
-                                      since='20170504',
-                                      future_warning=True)
-
     def getcurrenttimestamp(self):
         """
         Return the server time as a MediaWiki timestamp string.

