(#28) Ensure coverage cover sub-processes (#63)

Ensure sigterm is handled by coverage. This way, coverage can collect data before process termination

Issue was coverage does not handle sigterm by default, so it couldn't get to collect data upon termination: nedbat/coveragepy#1307 (comment)

Need to explicitly tell coverage to handle sigterm: https://coverage.readthedocs.io/en/latest/changes.html#version-6-4-2022-05-22

Signed-off-by: Imran Ariffin <ariffin.imran@gmail.com>

.coveragerc

@@ -2,3 +2,4 @@
 source = src/
 parallel = True
 concurrency = multiprocessing
+sigterm = True

src/aiotaskq/worker.py

@@ -19,7 +19,7 @@
 from .interfaces import ConcurrencyType, IConcurrencyManager, IPubSub
 from .pubsub import PubSub
 
-if t.TYPE_CHECKING:
+if t.TYPE_CHECKING:  # pragma: no cover
     from .task import Task
 
 logging.basicConfig(level=logging.INFO)