[PATCH] Update the routes.py, resolves 9

[hwelch-fle]

Changes

Allow: Route.__call__(**call_options)

This allows a route to be changed when it is called. useful if we want to construct an endpoint and pass data later

Use **overrides in register_route

All parameters passed to the Route initilizer are now dumped into **overrides variadic.

if json_request:
    overrides['json'] = params
else:
    overrides['params'] = params
    
if isinstance(self.handler, HTTPX_Sync) and json_request:
    return SyncRoute(method, endpoint, self.handler, **overrides)

this fixes #9 and cleans up the branching.