Add 'This is forked' message

README.md

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 - text: "LINE株式会社で[MASK]の研究・開発をしている。"
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-# LINE DistilBERT Japanese
+# LINE DistilBERT Japanese (forked by liwii)
 
-This is a DistilBERT model pre-trained on 131 GB of Japanese web text.
+This is a forked version of DistilBERT model pre-trained on 131 GB of Japanese web text.
 The teacher model is BERT-base that built in-house at LINE.
 The model was trained by [LINE Corporation](https://linecorp.com/).