my.instapaper: add stat; add mypy checks on CI

tox.ini

@@ -32,7 +32,11 @@ commands =
     # TODO ugh. somehow, user installed (editable??) packages leak into this environment??
     pip install -e .[testing] .[optional]
     pip install git+https://github.com/karlicoss/hypexport
-    python3 -m mypy -p my.hypothesis {posargs}
+    pip install git+https://github.com/karlicoss/instapexport
+    # todo I guess use a script...
+    python3 -m mypy -p my.hypothesis \
+                    -p my.instapaper \
+                    {posargs}
 
 
 # ideally, keep core modules only here