[mod] Update dependencies. In particular:

Click https://click.palletsprojects.com/en/7.x/changelog/#version-7-1-2
 - Fix test: the error message changed from double to simple cotes
PyNaCl: https://github.com/pyca/pynacl/blob/master/CHANGELOG.rst#140-2020-05-25
Pytest: https://docs.pytest.org/en/latest/changelog.html#pytest-5-4-3-2020-06-02

tests/test_tx.py

@@ -76,7 +76,7 @@ def test_tx_passed_amount_cli():
     assert result.exit_code == FAILURE_EXIT_STATUS
 
     result = CliRunner().invoke(cli, ["tx", "-r", "A", "-a", MINIMAL_TX_AMOUNT - 0.001])
-    assert 'Error: Invalid value for "--amount"' in result.output
+    assert "Error: Invalid value for '--amount'" in result.output
     assert result.exit_code == 2
 
     result = CliRunner().invoke(cli, ["tx", "-r", "A", "-a", 1, "-a", 2])