Extend concordance lists

src/MDConcWeights.php

@@ -24,6 +24,8 @@ final class MDConcWeights implements MDImporterConcordanceListInterface {
             "cm"        => false,
 
             "Gramm",
+            "g",
+            "G",
             "г"         => MDWeightUnit::g,
 
             default => throw new MDInvalidWeightUnit("Invalid weight unit " . $input),