[naver/pinpoint#5061] update for release 1.8.1

pinpoint-mysql/.env

@@ -1,4 +1,4 @@
-PINPOINT_VERSION=1.8.0
+PINPOINT_VERSION=1.8.1
 
 ### Pinpoint-mysql
 MYSQL_ROOT_PASSWORD=root123

pinpoint-mysql/Dockerfile

@@ -1,6 +1,6 @@
 FROM mysql:5.7
 
-ARG PINPOINT_VERSION=${PINPOINT_VERSION:-1.8.0}
+ARG PINPOINT_VERSION=${PINPOINT_VERSION:-1.8.1}
 
 RUN apt update \ 
 	&& apt-get install -y --no-install-recommends ca-certificates wget \

pinpoint-mysql/Readme.md

@@ -5,6 +5,7 @@ This Docker image contains the Pinpoint Mysql component of the Pinpoint applicat
 
 ## Supported Tags
 
+ - 1.8.1
  - 1.8.0
  - 1.7.3
  - 1.7.2