Fix invoice asyncio wrapper (#113)

* mypy: fix lightning backend warnings

* fix asyncio invoice creation

* ignore weird mypy error

tests/test_cli.py

@@ -1,6 +1,5 @@
 import asyncio
 
-import click
 import pytest
 from click.testing import CliRunner
 
@@ -117,7 +116,6 @@ def test_receive_tokenv1(mint):
     print(result.output)
 
 
-@pytest.mark.skip
 @pytest.mark.asyncio()
 def test_nostr_send(mint):
     runner = CliRunner()