Remove dependency on pkg_resources (#65)

Author: OliverHinesQC

dask_snowflake/__init__.py

@@ -1,8 +1,8 @@
-from pkg_resources import DistributionNotFound, get_distribution
+from importlib.metadata import PackageNotFoundError, version
 
 from .core import read_snowflake, to_snowflake
 
 try:
-    __version__ = get_distribution(__name__).version
-except DistributionNotFound:
-    pass
+    __version__ = version(__name__)
+except PackageNotFoundError:
+    __version__ = "unknown"