update v0.51.2 for frp

frpc/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.8
 LABEL maintainer="Stille <[email protected]>"
 
-ENV VERSION 0.51.1
+ENV VERSION 0.51.2
 ENV TZ=Asia/Shanghai
 WORKDIR /
 

frps/Dockerfile

@@ -1,7 +1,7 @@
 FROM alpine:3.8
 LABEL maintainer="Stille <[email protected]>"
 
-ENV VERSION 0.51.1
+ENV VERSION 0.51.2
 ENV TZ=Asia/Shanghai
 WORKDIR /