docs: Add space before link I always thought that adding a break line, it would automatically add a space. But from the current documentation page https://bolt80.com/piecrust/en/latest/getting-started/, looks like if the next line starts with a link, it gets truncated.

sudo: false
language: python
python:
  - "3.4"
  - "3.5"
install:
  - "python setup.py version -f 2.0"
  - "python setup.py sdist --formats=zip"
  - "pip install dist/PieCrust-2.0.zip"
script:
  - "py.test"