js-mdict

1. update search API
2. building key list indexing firstly
3. search keys precisely

1. upgrade some vulnerable dependencies
2. support range API
3. performance enhancement

1. fix babel-runtime dependency

1. fix uppercase sensitive bug
2. support v1.2 mdx file

1. support *.mdd files lookup, and it will return base64 format data

1. fix import error on ubuntu
2. rename uppercase files

1. support search words by prefix associate (the phrase as the words' prefix, not the phrase's prefix as search token just like prefix function)
2. some security updates

very thanks to @Danjame