Change base image to eclipse-temurin:8-jdk-alpine (#234)

There is no image named, openjdk:8-alpine hosted in Docker,  I just replace java for openjdk and it works 

Error Step 11/14: FROM java:8-jdk-alpine
manifest for java: 8-jdk-alpine not found: unknown manifest: unknown manifest

Step 11/14 : FROM openjdk:8-jdk-alpine
8-jdk-alpine: Pulling from library/openjdk
e7c96db7181b: Pull complete
f910a506b6cb: Pull complete
c2274a1a0e27: Pull complete
Digest: sha256:94792824df2df33402f201713f932b58cb9de94a0cd524164a0f2283343547b3
Status: Downloaded newer image for openjdk:8-jdk-alpine

Dockerfile

@@ -14,7 +14,7 @@ COPY src ./src
 RUN mvn clean package -DskipTests
 RUN mv target/ysoserial-*all*.jar target/ysoserial.jar
 
-FROM java:8-jdk-alpine
+FROM eclipse-temurin:8-jdk-alpine
 
 WORKDIR /app
 

README.md

@@ -1,13 +1,10 @@
 
 # ysoserial
 
-[![Join the chat at https://gitter.im/frohoff/ysoserial](
+[![GitHub release](https://img.shields.io/github/downloads/frohoff/ysoserial/latest/total)](https://github.com/frohoff/ysoserial/releases/latest/download/ysoserial-all.jar)
-    https://badges.gitter.im/frohoff/ysoserial.svg)](
+[![Travis Build Status](https://api.travis-ci.com/frohoff/ysoserial.svg?branch=master)](https://travis-ci.com/github/frohoff/ysoserial)
-    https://gitter.im/frohoff/ysoserial?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
-[![Download Latest Snapshot](https://img.shields.io/badge/download-master-green.svg)](
-    https://jitpack.io/com/github/frohoff/ysoserial/master-SNAPSHOT/ysoserial-master-SNAPSHOT.jar)
-[![Travis Build Status](https://api.travis-ci.com/frohoff/ysoserial.svg?branch=master)](https://travis-ci.com/frohoff/ysoserial)
 [![Appveyor Build status](https://ci.appveyor.com/api/projects/status/a8tbk9blgr3yut4g/branch/master?svg=true)](https://ci.appveyor.com/project/frohoff/ysoserial/branch/master)
+[![JitPack](https://jitpack.io/v/frohoff/ysoserial.svg)](https://jitpack.io/#frohoff/ysoserial)
 
 A proof-of-concept tool for generating payloads that exploit unsafe Java object deserialization.
 
@@ -103,14 +100,9 @@ $ java -cp ysoserial.jar ysoserial.exploit.RMIRegistryExploit myhost 1099 Common
 
 ## Installation
 
-1. Download the latest jar from
+[![GitHub release](https://img.shields.io/github/downloads/frohoff/ysoserial/latest/total)](https://github.com/frohoff/ysoserial/releases/latest/download/ysoserial-all.jar)
-[JitPack](https://jitpack.io/com/github/frohoff/ysoserial/master-SNAPSHOT/ysoserial-master-SNAPSHOT.jar)
-[![Download Latest Snapshot](https://img.shields.io/badge/download-master-green.svg)](
-    https://jitpack.io/com/github/frohoff/ysoserial/master-SNAPSHOT/ysoserial-master-SNAPSHOT.jar)
 
-Note that GitHub-hosted releases were removed in compliance with the
+Download the [latest release jar](https://github.com/frohoff/ysoserial/releases/latest/download/ysoserial-all.jar) from GitHub releases.
-[GitHub Community Guidelines](
-    https://help.github.com/articles/github-community-guidelines/#what-is-not-allowed)
 
 ## Building
 
@@ -120,7 +112,7 @@ Requires Java 1.7+ and Maven 3.x+
 
 ## Code Status
 
-[![Build Status](https://travis-ci.org/frohoff/ysoserial.svg?branch=master)](https://travis-ci.org/frohoff/ysoserial)
+[![Build Status](https://api.travis-ci.com/frohoff/ysoserial.svg?branch=master)](https://travis-ci.com/github/frohoff/ysoserial)
 [![Build status](https://ci.appveyor.com/api/projects/status/a8tbk9blgr3yut4g/branch/master?svg=true)](https://ci.appveyor.com/project/frohoff/ysoserial/branch/master)
 
 ## Contributing

pom.xml

@@ -39,7 +39,9 @@
 							<mainClass>ysoserial.GeneratePayload</mainClass>
 						</manifest>
 					</archive>
+					<descriptors>
 						<descriptor>assembly.xml</descriptor>						
+					</descriptors>
 				</configuration>
 				<executions>
 					<execution>
@@ -66,6 +68,16 @@
 	</build>
 
 	<repositories>
+		<repository>
+			<id>central</id>
+			<layout>default</layout>
+			<url>https://repo.maven.apache.org/maven2/</url>
+		</repository>		
+		<repository>
+			<id>ysoserial-m2-repo</id>
+			<layout>default</layout>
+			<url>https://raw.githubusercontent.com/frohoff/ysoserial-m2-repo/master</url>
+		</repository>
 		<repository>
 			<id>jenkins</id>
 			<layout>default</layout>