Fix autogenerate with ON UPDATE / DELETE (#258)

Fix an issue where the regular expression incorrectly parses the foreign
key constraint in case an `onupdate` / `ondelete` is present.

Closes: 257

Signed-off-by: Iustin Dumitrescu <idumitrescu@drivenets.com>

Author: idumitrescu-dn

sqlalchemy_cockroachdb/base.py

@@ -375,10 +375,10 @@ def _fk_regex_pattern(self):
             r"FOREIGN KEY \((.*?)\) "
             rf"REFERENCES (?:({qtoken})\.)?({qtoken})\(((?:{qtoken}(?: *, *)?)+)\)"  # noqa: E501
             r"[\s]?(MATCH (FULL|PARTIAL|SIMPLE)+)?"
-            r"[\s]?(ON UPDATE "
-            r"(CASCADE|RESTRICT|NO ACTION|SET NULL|SET DEFAULT)+)?"
             r"[\s]?(ON DELETE "
             r"(CASCADE|RESTRICT|NO ACTION|SET NULL|SET DEFAULT)+)?"
+            r"[\s]?(ON UPDATE "
+            r"(CASCADE|RESTRICT|NO ACTION|SET NULL|SET DEFAULT)+)?"
             r"[\s]?(DEFERRABLE|NOT DEFERRABLE)?"
             r"[\s]?(INITIALLY (DEFERRED|IMMEDIATE)+)?"
         )