Remove version element in Docker Compose files (#67)

Author: brfrn169

microservice-transaction-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.0

multi-storage-transaction-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.0

scalardb-analytics-postgresql-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3"
 services:
   analytics:
     image: ghcr.io/scalar-labs/scalardb-analytics-postgresql:3.10.3

scalardb-analytics-spark-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3"
 services:
   spark-shell:
     build:

scalardb-cluster-standalone-mode/docker-compose.yaml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.1

scalardb-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.1

spring-data-microservice-transaction-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.0

spring-data-multi-storage-transaction-sample/docker-compose.yml

@@ -1,4 +1,3 @@
-version: "3.5"
 services:
   mysql:
     image: mysql:8.0