Use the latest version of Poetry

Author: sdispater

.travis.yml

@@ -66,7 +66,8 @@ install:
         source "$HOME/virtualenvs/pypy-$PYPY_VERSION/bin/activate"
       fi
   - pip install pip -U
-  - curl -sSL https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py | python
+  - curl -fsS -o get-poetry.py https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py
+  - python get-poetry.py --preview -y
   - source $HOME/.poetry/env
   - poetry install -v
   - poetry build -v

appveyor.yml

@@ -20,7 +20,7 @@ install:
   - "python -m pip install --disable-pip-version-check --user --upgrade pip"
 
   # Downloading and installing poetry
-  - python -m pip install poetry -U
+  - python -m pip install poetry>=1.0.0b1 -U
 
   # Install dependencies
   - python -m pip install codecov