Support Korean language hashtags

tests.py

@@ -5326,6 +5326,7 @@ def _test_valid_hash_tag():
     assert valid_hash_tag('ThisIsValid12345')
     assert valid_hash_tag('ThisIsVälid')
     assert valid_hash_tag('यहमान्यहै')
+    assert valid_hash_tag('한국어')
     assert not valid_hash_tag('ThisIsNotValid!')
     assert not valid_hash_tag('#ThisIsAlsoNotValid')
     assert not valid_hash_tag('#यहमान्यहै')

utils.py

@@ -1864,6 +1864,11 @@ def _is_valid_language(text: str) -> bool:
         "Ogham": [5760, 5792],
         "Runic": [5792, 5888],
         "Khmer": [6016, 6144],
+        "Hangul Syllables": [44032, 55203],
+        "Hangul Jamo": [4352, 4607],
+        "Hangul Compatibility Jamo": [12592, 12687],
+        "Hangul Jamo Extended-A": [43360, 43391],
+        "Hangul Jamo Extended-B": [55216, 55295],
         "Mongolian": [6144, 6320]
     }
     for lang_name, lang_range in natural_languages.items():