Simplify test

tests/masonry/builders/fixtures/localversionlabel/README.rst

-Local version label
-===================

tests/masonry/builders/fixtures/localversionlabel/localversionlabel.py

-"""Example module"""
-
-__version__ = "0.1"
+"""Test fixture for https://github.com/sdispater/poetry/issues/756"""

tests/masonry/builders/fixtures/localversionlabel/pyproject.toml

 [tool.poetry]
 name = "localversionlabel"
 version = "0.1-beta.1+gitbranch-buildno-1"
-description = "Some description."
-authors = [
-    "Sébastien Eustace <sebastien@eustace.io>"
-]
-license = "MIT"
+authors = []
 
-readme = "README.rst"
-
-homepage = "https://poetry.eustace.io/"