Fix date pattern regexp

Author: Yarin78

fastjsonschema/draft07.py

@@ -3,7 +3,7 @@
 
 class CodeGeneratorDraft07(CodeGeneratorDraft06):
     FORMAT_REGEXS = dict(CodeGeneratorDraft06.FORMAT_REGEXS, **{
-        'date': r'^(?P<year>\d{4})-(?P<month>(0[1-9]|1[1-2]))-(?P<day>(0[1-9]|[12]\d|3[01]))\Z',
+        'date': r'^(?P<year>\d{4})-(?P<month>(0[1-9]|1[0-2]))-(?P<day>(0[1-9]|[12]\d|3[01]))\Z',
         'iri': r'^\w+:(\/?\/?)[^\s]+\Z',
         'iri-reference': r'^(\w+:(\/?\/?))?[^#\\\s]*(#[^\\\s]*)?\Z',
         'idn-email': r'^[^@]+@[^@]+\.[^@]+\Z',

tests/test_format.py

@@ -43,6 +43,7 @@ def test_hostname(asserter, value, expected):
     ('bla', exc),
     ('2018-2-5', exc),
     ('2018-02-05', '2018-02-05'),
+    ('2018-10-31', '2018-10-31'),
 ])
 def test_date(asserter, value, expected):
     asserter({