Nice to meet you, Thank you for the great OSS you are providing!
I love to using this OSS!

There is one problem in hashtag plugin with Japanese that I would like to fix, and I am sending this pull request.

Issue

• linkifyjs hashtag plugin cannot parse full width middle dot ・ correctly
• Full width middle dot ・ is a very important symbol in Japanese
  • That is used in many cases in Japanese
    • Name of person
    • Title of the work
    • Name of a sports team
    • Name of brand
• X (formerly Twitter) supports full width middle dot in hashtags

Examples

• #アラン・チューリング
  • Alan Mathison Turing
• #スター・ウォーズ
  • STAR WARS
• #レアル・マドリード
  • Real Madrid CF
• #コカ・コーラ
  • coca cola

How to fix

• I've added FULLWIDTHMIDDLEDOT to
  • packages/linkifyjs/src/text.js
  • packages/linkifyjs/src/scanner.js
• I've updated packages/linkify-plugin-hashtag/src/hashtag.js
• I've added test cases to
  • test/spec/linkifyjs/scanner.test.js
  • test/spec/linkify-plugin-hashtag.test.js

What I've checked

• npm run build
• npm run lint
• npm run test

I would be very grateful if this issue could be fixed.
I would appreciate your consideration of merge this pull request.