Use the latest installer for Poetry in CI

Author: sdispater

.travis.yml

@@ -63,7 +63,7 @@ install:
         virtualenv --python="$PYENV_ROOT/versions/pypy-$PYPY_VERSION/bin/python" "$HOME/virtualenvs/pypy-$PYPY_VERSION"
         source "$HOME/virtualenvs/pypy-$PYPY_VERSION/bin/activate"
       fi
-  - wget https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py
+  - wget https://raw.githubusercontent.com/sdispater/poetry/develop/get-poetry.py
   - python get-poetry.py --preview
   - 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
-  - curl -fsS -o get-poetry.py https://raw.githubusercontent.com/sdispater/poetry/master/get-poetry.py
+  - curl -fsS -o get-poetry.py https://raw.githubusercontent.com/sdispater/poetry/develop/get-poetry.py
   - python get-poetry.py --preview
 
   # Install dependencies