[cleanup] Simplify range checking in proofreadpage.py

Change-Id: I3cc966b44222aa2b48475b0980d6b35ceda2a2fc
---
M pywikibot/proofreadpage.py
1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/pywikibot/proofreadpage.py b/pywikibot/proofreadpage.py
index d05f932..4a72548 100644
--- a/pywikibot/proofreadpage.py
+++ b/pywikibot/proofreadpage.py
@@ -953,9 +953,7 @@
         if end is None:
             end = self.num_pages
 
-        if not ((1 <= start <= self.num_pages)
-                and (1 <= end <= self.num_pages)
-                and (start <= end)):
+        if not (1 <= start <= end <= self.num_pages):
             raise ValueError('start=%s, end=%s are not in valid range (%s, %s)'
                              % (start, end, 1, self.num_pages))
 

