Update to Java 11 (#56)

Author: rgomezcasas

Dockerfile

@@ -1,2 +1,2 @@
-FROM openjdk:8-slim-buster
+FROM openjdk:11-slim-buster
 WORKDIR /app

README.md

@@ -16,8 +16,8 @@ Here you have the [course on CodelyTV Pro where we explain step by step all this
 
 ## 🏁 How To Start
 
-1. Install Java 8: `brew cask install corretto8`
-2. Set it as your default JVM: `export JAVA_HOME='/Library/Java/JavaVirtualMachines/amazon-corretto-8.jdk/Contents/Home'`
+1. Install Java 11: `brew cask install corretto`
+2. Set it as your default JVM: `export JAVA_HOME='/Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home'`
 3. Clone this repository: `git clone https://github.com/CodelyTV/java-ddd-skeleton`.
 4. Bring up the Docker environment: `make up`.
 5. Execute some [Gradle lifecycle tasks](https://docs.gradle.org/current/userguide/java_plugin.html#lifecycle_tasks) in order to check everything is OK:

build.gradle

@@ -4,8 +4,8 @@ allprojects {
   apply plugin: 'io.spring.dependency-management'
   apply plugin: 'org.springframework.boot'
 
-  sourceCompatibility = 1.8
-  targetCompatibility = 1.8
+  sourceCompatibility = 11
+  targetCompatibility = 11
 
   repositories {
     mavenCentral()