Merge pull request #143 from rydente/update-docker-version

Update Docker Compose File to v3.3

docker-compose.yml

@@ -17,7 +17,7 @@
 # LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 # OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 # THE SOFTWARE.
-version: '3'
+version: '3.3'
 services:
   web:
     image: nginx:alpine