Go 1.16

The go command now builds packages in module-aware mode by default, even
when no go.mod is present. This is a big step toward using modules in
all projects.

  go.mod third party package not update with vendor
  remove go.mod and disable GO111MODULE in Makefile

  1. update change log
  2. fix ERR parse bug

  https://github.com/alecthomas/gometalinter/issues/445

* add test case  and notes

* vendor update

* use `tput setaf/srg0` set color in Makefile

* fix loadExternalResource fail cause panic

	Makefile color code regression
	remove ParseDSN debug log

* import bats for cli test

  https://github.com/sstephenson/bats

* add simple test case for cli use bats

* format main.bats add env

* replace main_test.sh with main.bats

  make explain suggestion sorted
  make index suggestion sorted

* add test database world_x

* update bats golden result

* make docker add 180s timeout

  1. add timeout for docker start
  2. add not explain able sql test case into explain_test.go

* explain info Using index VS Using index condition

  remove nonappearence key from explain extra info

* add timeout for test

  1. remove Index_Comment in ShowIndex function
  2. remove mysql client deps in Makefile

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

  change `connect` to `docker-connect`
  add `docker-it` for attaching into container

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

  go test ./... -update

  COL.015 text/blob default value only tobe `NULL`;
  COL.012 text/blob `NOT NULL` CONSTRAINT may be danagerous;

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

  1. Makefile add `daily-quick` let test more fast
  2. Heuristic rule word lint
  3. FUN.001 add more logic, unstable now

  MYSQL_RELEASE=percona MYSQL_VERSION=5.7 make docker

  #5
    Go version large than 1.8 has default GOPATH.
    use `go env GOPATH` get GOPATH envirment variable.

  daily build update
    update vitess vendor package
    update document about installation and configration