Improve performance

1. add method encodeMsg2, Improve performance 1x
2. optimize performance encodeMsg
3. optimize performance decodeMsg, Improve performance 1x
4. change msg construct add params opts
   • opts, {useIconv: true }
     • useIconv, boolean, true(default): use iconv-lite convert code.( false, Improve performance)
5. Default string code,change to utf8

1.1.0

1. Using ES6 syntax

2. optimize performance encodeMsg

cppMsg

1. fix int64 decode/encode error( Works only for numbers <= Number.MAX_SAFE_INTEGER ).
2. fix object decode error.

first release

1.0.1

update readme