drop py37 compat code (#157)

keewis · web-flow · commit eec47fce4451 · 2022-03-11T10:51:16.000+01:00
diff --git a/pint_xarray/__init__.py b/pint_xarray/__init__.py
@@ -1,7 +1,4 @@
-try:
-    from importlib.metadata import version
-except ImportError:
-    from importlib_metadata import version
+from importlib.metadata import version
 
 import pint
 
