fix: replace deprecated ioutil.ReadAll with io.ReadAll

ioutil.ReadAll has been deprecated since Go 1.16.

名詞 非自立 is possible

DebugWriter

fix 副助詞／並立助詞／終助詞

remove default dict

user dic

support UserDict

Merge pull request #3 from akiomik/patch-1

Fix isWord

Merge pull request #3 from akiomik/patch-1

Fix isWord

非自立