Add proxy support [#16]

[dnl-blkv]

Fixes #16

[dnl-blkv]

@OGKevin deserialisation is fixed! 👍

[OGKevin]

@dnl-blkv My tests are failing while creating new context.

File "/Users/khellemun/GitHub/bunq/sdk_python/bunq/sdk/client.py", line 105, in _request
    proxies={self._FIELD_PROXY_HTTPS: self._api_context.proxy_url}
AttributeError: 'ApiContext' object has no attribute 'proxy_url'

sdk_python/tests/bunq_test.py

Line 40 in 40627c5

api_context = ApiContext(ApiEnvironmentType.SANDBOX, cls._API_KEY,

What could be causing this ?

[OGKevin]

Hmm weird just did a clean checkout again merged dev and tests are passing 🤔

[OGKevin]

This function has a lot of arguments, why not reformat it to:

def __init__(self, environment_type, api_key,
                   device_description,  permitted_ips=None, proxy_url=None):

(nicely aligned of course 😉 )
3 args on a row or:

    def __init__(
            self,
            environment_type,
            api_key,
            device_description,
            permitted_ips=None,
            proxy_url=None):

1 arg per line ?

[dnl-blkv]

1. Not PEP-8
2. Takes too much space

This one is OK, we do it everywhere :)

[OGKevin]

ack

[OGKevin]

Tests passing 👏 looks good 🏅

@andrederoos