update v4.28.1

v2ray/Dockerfile

@@ -1,5 +1,5 @@
 FROM playn/alpine:3.12.0
-ARG v2ray_version=4.27.5
+ARG v2ray_version=4.28.1
 RUN set -ex && \
     apk --no-cache add ca-certificates && \
     mkdir /usr/bin/v2ray && \

v2ray/Dockerfile.builder

@@ -1,4 +1,4 @@
-FROM golang:1.14-alpine AS builder
+FROM golang:1.15.2-alpine3.12 AS builder
 RUN apk --no-cache add git bash curl
 WORKDIR /go/src/v2ray.com/core
 RUN git clone --progress https://github.com/v2fly/v2ray-core.git . && \

v2ray/Dockerfile.fly

@@ -1,5 +1,5 @@
 FROM playn/alpine:3.12.0
-ARG v2fly_version=4.27.5
+ARG v2fly_version=4.28.1
 RUN set -ex && \
     apk --no-cache add ca-certificates && \
     mkdir /usr/bin/v2ray && \