use mercurial's ui.configbool API to retrieve booleans

CONTRIBUTORS.txt

@@ -3,4 +3,5 @@ Project created by Tarek Ziadé.
 Contributors:
 
 - Tamás Gulácsi
+- Nicolas Dumazet
 

flake8/run.py

@@ -70,11 +70,9 @@ def hg_hook(ui, repo, **kwargs):
     for file_ in _get_files(repo, **kwargs):
         warnings += check_file(file_)
 
-    strict = ui.config('flake8', 'strict')
-    if strict is None:
-        strict = True
+    strict = ui.configbool('flake8', 'strict', default=True)
 
-    if strict.lower() in ('1', 'true'):
+    if strict:
         return warnings
 
     return 0