change encoding/json -> github.com/CorgiMan/json2

* fix #176

  JSON datatype only support utf8mb4 now

* splitstatement support optimizer hint

  https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html
  https://dev.mysql.com/doc/refman/8.0/en/comments.html

* vendor daily update

  https://dev.mysql.com/doc/refman/8.0/en/optimizer-hints.html
  https://dev.mysql.com/doc/refman/8.0/en/comments.html

  single table select * don't auto-complete table name
  multi table select tb1.*, tb2.* auto-complete table name

  1. update vendor pingcap/parser
  2. Makefile add docker contain stop wait
  3. -report-type=rewrite when syntax error, print error info not empty

not fix too many connections yet

  RuleTimePrecision
  MySQL 5.6.4+ New time data type, support time precision to microsecond

  go test ./... -update

  ref: https://github.com/XiaoMi/soar/pull/147

  Thanks @xiyangxixian

  single line comment in sql will merge next line into before one.

  trimspace before check single line comment

  SplitStatement check if single comment line is in multi-line sql.

  pure comment line should break quickly, single comment in multi-line
  sql should wait for line delimiter

  1. go version move into Makefile
  2. add golden test for ast
  3. explainAbleSQL use tidb parser also

  multi-line comment will cause line counter error, when
  -report-type=lint

  1. SplitStatement mulitstatement eof bug
  2. empty query by pass

  #47 pretty print function `format` endless loop
  #37 -report-type not in (markdown, html) will not print score