Can't install dependencies from master.

Summary.

## Expected Result
Running 'Pipenv install', pipenv install Pipfile or pipenv install Pipfile.lock should not return an error. 

## Actual Result

The following error is returned:
Step 6/7 : RUN pipenv install
 ---> Running in a8d473741a35
Pipfile.lock (5c8d24) out of date, updating to (726701)…
Locking [dev-packages] dependencies…
⠸ Locking..✔ Success! 
Locking [packages] dependencies…
⠙ Locking..✘ Locking Failed! 
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/resolver.py", line 61, in resolve
[pipenv.exceptions.ResolutionFailure]:       return resolve_deps(
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 718, in resolve_deps
[pipenv.exceptions.ResolutionFailure]:       resolved_tree, hashes, markers_lookup, resolver = actually_resolve_deps(
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 480, in actually_resolve_deps
[pipenv.exceptions.ResolutionFailure]:       resolved_tree = resolver.resolve()
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 395, in resolve
[pipenv.exceptions.ResolutionFailure]:       raise ResolutionFailure(message=str(e))
[pipenv.exceptions.ResolutionFailure]:       pipenv.exceptions.ResolutionFailure: ERROR: ERROR: Could not find a version that matches pipfile-lock
[pipenv.exceptions.ResolutionFailure]:       No versions found
[pipenv.exceptions.ResolutionFailure]: Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  First try clearing your dependency cache with $ pipenv lock --clear, then try the original command again.
 Alternatively, you can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
ERROR: ERROR: Could not find a version that matches pipfile-lock
No versions found
Was https://pypi.org/simple/ reachable?
[pipenv.exceptions.ResolutionFailure]:       return resolve_deps(
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 718, in resolve_deps
[pipenv.exceptions.ResolutionFailure]:       resolved_tree, hashes, markers_lookup, resolver = actually_resolve_deps(
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 480, in actually_resolve_deps
[pipenv.exceptions.ResolutionFailure]:       resolved_tree = resolver.resolve()
[pipenv.exceptions.ResolutionFailure]:   File "/usr/local/lib/python3.8/site-packages/pipenv/utils.py", line 395, in resolve
[pipenv.exceptions.ResolutionFailure]:       raise ResolutionFailure(message=str(e))
[pipenv.exceptions.ResolutionFailure]:       pipenv.exceptions.ResolutionFailure: ERROR: ERROR: Could not find a version that matches pipfile-lock
[pipenv.exceptions.ResolutionFailure]:       No versions found
[pipenv.exceptions.ResolutionFailure]: Warning: Your dependencies could not be resolved. You likely have a mismatch in your sub-dependencies.
  First try clearing your dependency cache with $ pipenv lock --clear, then try the original command again.
 Alternatively, you can use $ pipenv install --skip-lock to bypass this mechanism, then run $ pipenv graph to inspect the situation.
  Hint: try $ pipenv lock --pre if it is a pre-release dependency.
ERROR: ERROR: Could not find a version that matches pipfile-lock
No versions found
Was https://pypi.org/simple/ reachable?

## Reproduction Steps
run the command 'sudo docker build .' with the following Dockerfile in the repo's root directory 

from python:3.8-buster

ADD . /src
WORKDIR /src
RUN pip3.8 install pipenv
RUN pipenv --python 3.8
RUN pipenv install
RUN pytest


## System Information
Bug occured under python 3.6, 3.7 and 3.8. Tested in a local install (ubuntu) and within a docker container (python:3.8-buster ).

Pipenv versions is 2018.11.26 




I had run pipenv install Pipfile and Pipfile.lock previously which had modified the Pipfile.