compose: `logs` encoding is incorrect

Description of the issue

docker-compose logs outputs as a Windows-specific encoding while docker logs properly outputs as utf-8

ofek.lev@OZONE C:\Users\ofek.lev\Desktop\code\integrations-core\riakcs\tests\compose
$ python
Python 3.6.5 |Anaconda, Inc.| (default, Mar 29 2018, 13:32:41) [MSC v.1900 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> import subprocess
>>> import sys
>>> print(sys.getdefaultencoding())
utf-8
>>> for line in subprocess.run('docker logs 9f3b1d3828a3', stdout=subprocess.PIPE).stdout.splitlines()[:2]: print(line)
...
b"Update data permissions in case it's mounted as volume\xe2\x80\xa6 OK!"
b'Starting Riak\xe2\x80\xa6 OK!'
>>> for line in subprocess.run('docker-compose logs --no-color', stdout=subprocess.PIPE).stdout.splitlines()[:3]: print(line)
...
b'Attaching to dd-test-riakcs'
b"dd-test-riakcs    | Update data permissions in case it's mounted as volume\x85 OK!"
b'dd-test-riakcs    | Starting Riak\x85 OK!'
>>> for line in subprocess.run('docker-compose logs --no-color', stdout=subprocess.PIPE, encoding='cp1252').stdout.splitlines()[:3]: print(line.encode())
...
b'Attaching to dd-test-riakcs'
b"dd-test-riakcs    | Update data permissions in case it's mounted as volume\xe2\x80\xa6 OK!"
b'dd-test-riakcs    | Starting Riak\xe2\x80\xa6 OK!'

Context information (for bug reports)

Output of docker-compose version

docker-compose version 1.23.2, build 1110ad01
docker-py version: 3.6.0
CPython version: 3.6.6
OpenSSL version: OpenSSL 1.0.2o  27 Mar 2018

Output of docker version

Client: Docker Engine - Community
 Version:           18.09.2
 API version:       1.39
 Go version:        go1.10.8
 Git commit:        6247962
 Built:             Sun Feb 10 04:12:31 2019
 OS/Arch:           windows/amd64
 Experimental:      false

Server: Docker Engine - Community
 Engine:
  Version:          18.09.2
  API version:      1.39 (minimum version 1.12)
  Go version:       go1.10.6
  Git commit:       6247962
  Built:            Sun Feb 10 04:13:06 2019
  OS/Arch:          linux/amd64
  Experimental:     false
 Kubernetes:
  Version:          v1.10.11
  StackAPI:         v1beta2

Output of docker-compose config

services:
  dd-test-riakcs:
    container_name: dd-test-riakcs
    environment:
      RIACK_CS_BUCKET: foo
    image: ianbytchek/riak-cs
    ports:
    - published: 8080
      target: 8080
version: '3.5'

Observed result

encoding (after much debugging to render ellipsis properly) is cp1252

Expected result

encoding should be utf-8

Additional information

Windows 10 pro, docker-compose installed via pip

cc @shin-