Fix the centos version

When user cat /etc/system-release, user would know the centos version. It should be 7.5
2020-07-13 08:23:25 +08:00 · 2020-07-13 08:23:25 +08:00 · c7e225a4eb
commit c7e225a4eb
parent 4f96790cf3
1 changed files with 1 additions and 2 deletions
--- a/tools/docker/Dockerfile.centos7.5
+++ b/tools/docker/Dockerfile.centos7.5
@ -2,8 +2,7 @@ FROM centos:7.5.1804

 LABEL maintainer="He Sun <bochang.sh@antfin.com>"

-RUN yum update -y && \
-    yum install -y \
+RUN yum install -y \
        astyle \
        autoconf \
        automake \