v1.20.7 Code organization + date order fine tuning

Author: akariv

tableschema/VERSION

@@ -1 +1 @@
-1.20.6
+1.20.7

tableschema/schema.py

@@ -541,6 +541,20 @@ def __hash__(self):
 
 
 # Internal
+_INFER_DATE_FORMATS = [
+    '%Y-%m-%d',
+    '%d/%m/%Y',
+    '%m/%d/%Y',
+    '%d/%m/%y',
+    '%m/%d/%y',
+    '%Y%m%d',
+    '%d-%m-%y',
+    '%Y/%m/%d',
+    '%d.%m.%Y',
+    '%d%m%y',
+    '%d.%m.%y',
+]
+
 
 _INFER_TYPE_ORDER = [
     'duration',
@@ -550,7 +564,7 @@ def __hash__(self):
     'array',
     'datetime',
     'time',
-    ('date', ('%Y-%m-%d', '%Y/%m/%d', '%d/%m/%Y', '%m/%d/%Y', '%Y%m%d', '%Y.%m.%d', '%y-%m-%d', '%y/%m/%d', '%d/%m/%y', '%m/%d/%y', '%y%m%d', '%y.%m.%d')),
+    ('date', _INFER_DATE_FORMATS),
     'integer',
     'number',
     'boolean',