Allow --sigkey-file to be a symlink

Also adds the first tests (using pytest) & a short paragraph to the
README on how to run them.

1 files changed, 10 insertions, 0 deletions

diff --git a/README.md b/README.md
index ed9a389..65a8b37 100644
--- a/README.md
+++ b/README.md
@@ -9,3 +9,13 @@ The full license text can be found in the file LICENSE.
 
 This license is also known as the BSD-2-Clause and the Simplified BSD
 License.
+
+## Hacking
+
+### Running tests
+
+Use [`pytest`](https://docs.pytest.org/) to run the automated tests:
+
+```
+$ pytest .
+```