Clean up edtf parser code (remove old test case comments)

src/undate/converters/edtf/edtf.lark

@@ -16,7 +16,7 @@ date: year | year "-" month | year "-" month "-" day
 
 year: /-?\d+/
 month: /(0[1-9])|(1[0-2])/
-day: /([0-2][1-9])|(3[0-1])/
+day: /([0-2][0-9])|(3[0-1])/
 
 timeinterval: date "/" date
 

src/undate/converters/edtf/parser.py

@@ -1,45 +1,8 @@
-import os.path
+import pathlib
 
 from lark import Lark
 
-grammar_path = os.path.join(os.path.dirname(__file__), "edtf.lark")
+grammar_path = pathlib.Path(__file__).parent / "edtf.lark"
 
 with open(grammar_path) as grammar:
     edtf_parser = Lark(grammar.read(), start="edtf")
-
-
-# testcases = [
-#     "1984",
-#     "1984-05",
-#     "1984-12",
-#     "1001-03-30",
-#     "1000/2000",
-#     "1000-01/2000-05-01",
-#     # level 1
-#     "Y170000002",
-#     "2001-21",  # spring 2001
-#     # qualifiers
-#     "1984?",
-#     "2004-06~",
-#     "2004-06-11%",
-#     # unspecified digits from right
-#     "201X",
-#     "20XX",
-#     "2004-XX",
-#     "1985-04-XX",
-#     "1985-XX-XX",
-#     # open ended intervals
-#     "1985-04-12/..",
-#     "1985-04/..",
-#     "../1985-04-12",
-#     "/1985-04-12",
-#     "1984-13",
-# ]
-
-# for testcase in testcases:
-#     print(f"\n{testcase}")
-#     tree = edtf_parser.parse(testcase)
-#     print(tree.pretty())
-
-
-# error_cases = ["1984-13", "Y1702"]