update feature number.
update feature number.

Signed-off-by: Bo-Yi Wu <f80eec1bf98b3feebacc247f35f2b506218004cb@gmail.com>

thewhitetulip/web-dev-golang-anti-textbook,thewhitetulip/web-dev-golang-anti-textbook,thewhitetulip/web-dev-golang-anti-textbook