ignore coverage on python 3.9 pairwise workaround

will be removed with a bump to 3.10

Author: TomHall2020

archeryutils/handicaps/handicap_equations.py

@@ -61,7 +61,8 @@
 
 # itertools.pairwise not available until python 3.10
 # workaround can be removed when support for 3.9 is dropped
-if not hasattr(itr, "pairwise"):
+# ignore for coverage (runner is > 3.10, ci shows this works on 3.9)
+if not hasattr(itr, "pairwise"):  # pragma: no cover
 
     def _pairwise(iterable):
         a, b = itr.tee(iterable)