Bump dependencies to get working on Python 3.12 (#22)

This bumps some dependencies so that they no longer use the old collections module, which fixes errors like this on Python 3.12 (and possibly earlier?)

    ImportError: cannot import name 'Container' from 'collections'

After this I was able to get lnt running via

    $ python -m venv venv
    $ source venv/bin/activate
    $ pip install setuptools
    $ python setup.py develop
    $ python -m lnt.lnttool.main --version

I only bumped the packages as much as needed, so they're not fully up-to-date.

Author: lukel97

setup.py

@@ -119,10 +119,10 @@
         "aniso8601==1.2.0",
         "Flask==0.12.2",
         "Flask-RESTful==0.3.4",
-        "Jinja2==2.7.2",
-        "MarkupSafe==0.23",
+        "Jinja2==2.11.3",
+        "MarkupSafe==1.1.1",
         "SQLAlchemy==1.2.19",
-        "Werkzeug==0.12.2",
+        "Werkzeug==0.15.6",
         "itsdangerous==0.24",
         "python-gnupg==0.3.7",
         "pytz==2016.10",