using newer solution to fetch package version

also fixed ess.__name__
see https://packaging.python.org/guides/single-sourcing-package-version/

ess/__init__.py

@@ -3,7 +3,12 @@ from . import installed
 from . import lib_tw
 from . import fieldmap
 from .nextcloud import nextcloud
-from pkg_resources import get_distribution, DistributionNotFound
+
+try:
+    from importlib import metadata
+except ImportError:
+    # Running on pre-3.8 Python; use importlib-metadata package
+    import importlib_metadata as metadata  # type: ignore
 
 __all__ = [
     "fieldmap",
@@ -15,10 +20,10 @@ __all__ = [
     "nextcloud",
 ]
 
-__name__ = "ess"
+__name__ = "ess-python-tools"
 
 try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
+    __version__ = metadata.version(__name__)
+except metadata.PackageNotFoundError:
     # package is not installed
     pass