v1.8.0

• the code now conforms to pep8, @seppeljordan, #105
• release.nix should use callPackage instead of listing all of the arguments, @globin, #107
• combine requirements.nix and requirements_generated.nix into one, @seppeljordan, #108
• new cli option (-O) to point to custom requirements_override.nix file, @seppeljordan, #109, #119
• replace nix-prefetch-scripts with nix-prefetch-git and nix-prefetch-hg, @seppeljordan, #118
• only check for extensions for available releases, @garbas, 36591bf
• zc.recipe.egg was not imported in buildout environment, @garbas, 3529107
• added python36 support, @garbas, f08c361
• add ability to handle extras with local paths via requirements.txt file, @garbas, 25ae5f9
• adding pillow, connexion and aiohttp examples, @garbas, f1d9e52
• multiple people reporting problems with pypi2nix and helping them:
  • @copumpkin -> #104
  • @exarkun -> #110
  • @jlesquembre -> #116
  • @blakesweeney -> #117