Added --update to CLI export; reference issue #100

tests/conftest.py

@@ -0,0 +1,9 @@
+""" pytest test configuration """
+import pytest
+
+from osxphotos.exiftool import _ExifToolProc
+
+@pytest.fixture(autouse=True)
+def reset_singletons():
+    """ Need to clean up any ExifTool singletons between tests """
+    _ExifToolProc.instance = None