Fix typo in README.

[k65miyazakiy]

In README.md, docker-compose file name is written "docer-compose-eventuate-{dbms}.yml", but actual it is "docker-compose-{dbms}.yml".

• before fix

  [k@localhost]~/work/eventuate/eventuate-tram-examples-java-spring-todo-list/multi-module% docker-compose -f docker-compose-eventuate-mysql.yml build
  using podman version: podman version 2.2.1
  missing files:  ['docker-compose-eventuate-mysql.yml']

• after fix

  [k@localhost]~/work/eventuate/eventuate-tram-examples-java-spring-todo-list/multi-module% docker-compose -f docker-compose-mysql.yml build
  using podman version: podman version 2.2.1
  podman build -t multi-module_todolistcommandservice -f ./todo-service/Dockerfile ./todo-service/
  STEP 1: FROM java:openjdk-8u111-alpine
  STEP 2: CMD java ${JAVA_OPTS} -jar todo-service.jar
  ...