更新 Dockerfile

 #FROM golang:latest
-FROM 192.168.0.243:5000/mmm/mmm-worth:2020042
+FROM 192.168.0.243:5000/mmm/mmm-worth:20200427
 MAINTAINER linmadan <772181827@qq.com>
 ENV APP_DIR $GOPATH/src/mmm-worth
 RUN mkdir -p $APP_DIR