Error during install httpcore's third party dependencies #150

$ pip install -r requirements.txt
....
Successfully built urwid pyperclip kaitaistruct blinker
ERROR: mitmproxy 5.2 has requirement sortedcontainers<2.2,>=2.1.0, but you'll have sortedcontainers 2.2.2 which is incompatible.
Installing collected packages: sortedcontainers, attrs, outcome, idna, async-generator, sniffio, trio, mypy-extensions, typed-ast, typing-extensions, mypy, trio-typing, tornado, Markdown, PyYAML, MarkupSafe, Jinja2, six, livereload, future, tqdm, regex, click, joblib, nltk, lunr, mkdocs, mkautodoc, mkdocs-material-extensions, Pygments, pymdown-extensions, mkdocs-material, urllib3, certifi, chardet, requests, requests-toolbelt, pkginfo, docutils, webencodings, pyparsing, packaging, bleach, readme-renderer, keyring, colorama, rfc3986, twine, py, iniconfig, more-itertools, toml, pluggy, pytest, pytest-asyncio, pytest-trio, coverage, pytest-cov, appdirs, pathspec, black, pyflakes, autoflake, isort, hyperframe, protobuf, h11, wsproto, pyasn1, urwid, ruamel.yaml.clib, ruamel.yaml, publicsuffix2, itsdangerous, Werkzeug, flask, ldap3, zstandard, passlib, pyperclip, hpack, h2, pycparser, cffi, cryptography, pyOpenSSL, Brotli, kaitaistruct, blinker, mitmproxy, trustme, httptools, uvloop, websockets, uvicorn, httpcore
  Running setup.py develop for httpcore
Successfully installed Brotli-1.0.7 Jinja2-2.11.2 Markdown-3.2.2 MarkupSafe-1.1.1 PyYAML-5.3.1 Pygments-2.6.1 Werkzeug-1.0.1 appdirs-1.4.4 async-generator-1.10 attrs-19.3.0 autoflake-1.3.1 black-19.10b0 bleach-3.1.5 blinker-1.4 certifi-2020.6.20 cffi-1.14.1 chardet-3.0.4 click-7.1.2 colorama-0.4.3 coverage-5.2.1 cryptography-2.9.2 docutils-0.16 flask-1.1.2 future-0.18.2 h11-0.9.0 h2-3.2.0 hpack-3.0.0 httpcore httptools-0.1.1 hyperframe-5.2.0 idna-2.10 iniconfig-1.0.1 isort-5.3.2 itsdangerous-1.1.0 joblib-0.16.0 kaitaistruct-0.8 keyring-21.3.0 ldap3-2.7 livereload-2.6.2 lunr-0.5.8 mitmproxy-5.2 mkautodoc-0.1.0 mkdocs-1.1.2 mkdocs-material-5.5.5 mkdocs-material-extensions-1.0 more-itertools-8.4.0 mypy-0.782 mypy-extensions-0.4.3 nltk-3.5 outcome-1.0.1 packaging-20.4 passlib-1.7.2 pathspec-0.8.0 pkginfo-1.5.0.1 pluggy-0.13.1 protobuf-3.11.3 publicsuffix2-2.20191221 py-1.9.0 pyOpenSSL-19.1.0 pyasn1-0.4.8 pycparser-2.20 pyflakes-2.2.0 pymdown-extensions-8.0 pyparsing-2.4.7 pyperclip-1.8.0 pytest-6.0.1 pytest-asyncio-0.14.0 pytest-cov-2.10.0 pytest-trio-0.6.0 readme-renderer-26.0 regex-2020.7.14 requests-2.24.0 requests-toolbelt-0.9.1 rfc3986-1.4.0 ruamel.yaml-0.16.10 ruamel.yaml.clib-0.2.0 six-1.15.0 sniffio-1.1.0 sortedcontainers-2.2.2 toml-0.10.1 tornado-6.0.4 tqdm-4.48.2 trio-0.16.0 trio-typing-0.5.0 trustme-0.6.0 twine-3.2.0 typed-ast-1.4.1 typing-extensions-3.7.4.2 urllib3-1.25.10 urwid-2.0.1 uvicorn-0.11.8 uvloop-0.14.0 webencodings-0.5.1 websockets-8.1 wsproto-0.15.0 zstandard-0.13.0

(venv-httpcore) ~/workspace/skv/httpcore % pip freeze
appdirs==1.4.4
async-generator==1.10
attrs==19.3.0
autoflake==1.3.1
black==19.10b0
bleach==3.1.5
blinker==1.4
Brotli==1.0.7
certifi==2020.6.20
cffi==1.14.1
chardet==3.0.4
click==7.1.2
colorama==0.4.3
coverage==5.2.1
cryptography==2.9.2
docutils==0.16
Flask==1.1.2
future==0.18.2
h11==0.9.0
h2==3.2.0
hpack==3.0.0
-e git+git@github.com:encode/httpcore.git@2328b0c5154fce375a60095e43b0743b22287984#egg=httpcore
httptools==0.1.1
hyperframe==5.2.0
idna==2.10
iniconfig==1.0.1
isort==5.3.2
itsdangerous==1.1.0
Jinja2==2.11.2
joblib==0.16.0
kaitaistruct==0.8
keyring==21.3.0
ldap3==2.7
livereload==2.6.2
lunr==0.5.8
Markdown==3.2.2
MarkupSafe==1.1.1
mitmproxy==5.2
mkautodoc==0.1.0
mkdocs==1.1.2
mkdocs-material==5.5.5
mkdocs-material-extensions==1.0
more-itertools==8.4.0
mypy==0.782
mypy-extensions==0.4.3
nltk==3.5
outcome==1.0.1
packaging==20.4
passlib==1.7.2
pathspec==0.8.0
pkginfo==1.5.0.1
pluggy==0.13.1
protobuf==3.11.3
publicsuffix2==2.20191221
py==1.9.0
pyasn1==0.4.8
pycparser==2.20
pyflakes==2.2.0
Pygments==2.6.1
pymdown-extensions==8.0
pyOpenSSL==19.1.0
pyparsing==2.4.7
pyperclip==1.8.0
pytest==6.0.1
pytest-asyncio==0.14.0
pytest-cov==2.10.0
pytest-trio==0.6.0
PyYAML==5.3.1
readme-renderer==26.0
regex==2020.7.14
requests==2.24.0
requests-toolbelt==0.9.1
rfc3986==1.4.0
ruamel.yaml==0.16.10
ruamel.yaml.clib==0.2.0
six==1.15.0
sniffio==1.1.0
sortedcontainers==2.2.2
toml==0.10.1
tornado==6.0.4
tqdm==4.48.2
trio==0.16.0
trio-typing==0.5.0
trustme==0.6.0
twine==3.2.0
typed-ast==1.4.1
typing-extensions==3.7.4.2
urllib3==1.25.10
urwid==2.0.1
uvicorn==0.11.8
uvloop==0.14.0
webencodings==0.5.1
websockets==8.1
Werkzeug==1.0.1
wsproto==0.15.0
zstandard==0.13.0