dependencies: freeze pathlib to 2.3.0 for compatability

pkgs/python-packages.nix

@@ -398,8 +398,8 b''
     doCheck = false;
     propagatedBuildInputs = with self; [six scandir];
     src = fetchurl {
-      url = "https://pypi.python.org/packages/a1/14/df0deb867c2733f7d857523c10942b3d6612a1b222502fdffa9439943dfb/pathlib2-2.3.0.tar.gz";
-      md5 = "89c90409d11fd5947966b6a30a47d18c";
+      url = "https://files.pythonhosted.org/packages/a1/14/df0deb867c2733f7d857523c10942b3d6612a1b222502fdffa9439943dfb/pathlib2-2.3.0.tar.gz";
+      sha256 = "d32550b75a818b289bd4c1f96b60c89957811da205afcceab75bc8b4857ea5b3";
     };
     meta = {
       license = [ pkgs.lib.licenses.mit ];

requirements.txt

@@ -14,6 +14,7 b' pyramid-jinja2==2.7'
 Jinja2==2.9.6
 pyramid==1.9.1
 pyramid-mako==1.0.2
+pathlib2==2.3.0
 repoze.lru==0.7
 simplejson==3.11.1
 subprocess32==3.2.7