Merge pull request #2114 from DimitriPapadopoulos/singed

singed could be sang/sung too
diff --git a/codespell_lib/data/dictionary_rare.txt b/codespell_lib/data/dictionary_rare.txt
index 58d455a..bb7fcb1 100644
--- a/codespell_lib/data/dictionary_rare.txt
+++ b/codespell_lib/data/dictionary_rare.txt
@@ -143,7 +143,7 @@
 sightly->slightly
 simplication->simplification
 singe->single
-singed->signed, singled,
+singed->signed, singled, sang, sung,
 slippy->slippery
 specif->specify, specific,
 statics->statistics