HI,

Dynaconf heavily uses `python-dotenv` 

https://dynaconf.readthedocs.io

https://github.com/rochacbruno/dynaconf

Just wanted to help proofread!

- Fall back to `collections.namedtuple` for `Binding` when typing is
  not present
- Add import guards to all imports
- Fixes #178
- Add missing coverage config to setup.cfg

The dependency on the `typing` package is now optional for Python 3.4.
This commit runs (part of) the test suite in when that package is
absent, to make sure the dependency isn't reintroduced accidentally.

If a line can't be parsed (e.g. `FOO: BAR` is invalid), it is printed as
a warning on stderr.

As usual, after such an error, Python-dotenv tries to parse the rest of
the file and the application can use the successfully parsed variable
bindings.

Signed-off-by: ulyssessouza <ulyssessouza@gmail.com>

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>