Replace pipenv with poetry

.gitignore

@@ -8,6 +8,9 @@
 *.egg
 *.class
 
+# Poetry lock file
+poetry.lock
+
 # Unit test / coverage reports
 .tox/
 .coverage

.travis.yml

@@ -16,6 +16,7 @@ matrix:
 cache:
   directories:
     - stripe-mock
+    - "${HOME}/.cache/pypoetry"
   pip: true
 
 env:
@@ -37,7 +38,10 @@ before_install:
   - export PATH="${PATH}:${PWD}/stripe-mock/stripe-mock_${STRIPE_MOCK_VERSION}"
 
 install:
-  - make init
+  - pip install --upgrade pip
+  - curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
+  - source ${HOME}/.poetry/env
+  - poetry install -v
 
 script:
   - if [[ $TRAVIS_PYTHON_VERSION == '2.7' ]]; then make lint; fi

Makefile

@@ -1,27 +1,17 @@
-init:
-	# Pin pipenv to 2018.10.13 because further releases are incompatible with
-	# PyPy3. The issue was fixed in https://github.com/pypa/pipenv/pull/3322
-	# but no new version has been released yet.
-	# Also pin pip to 18.x because with more recent versions, we'd need to
-	# pass `--no-use-pep517`, which pipenv doesn't let us do. Cf.
-	# https://github.com/pypa/pipenv/issues/3651
-	pip install --upgrade pip~=18.0 pipenv==2018.10.13
-	pipenv install --dev --skip-lock
-
 test:
-	pipenv run tox -p auto
+	poetry run tox -p auto
 
 ci:
-	pipenv run pytest --cov=stripe
+	poetry run pytest --cov=stripe
 
 coveralls:
-	pipenv run coveralls
+	poetry run coveralls
 
 fmt:
-	pipenv run tox -e fmt
+	poetry run tox -e fmt
 
 fmtcheck:
-	pipenv run tox -e fmt -- --check --verbose
+	poetry run tox -e fmt -- --check --verbose
 
 lint:
-	pipenv run tox -e lint
+	poetry run tox -e lint