Add testdata from reported issues

testdata/issues/42.md

@@ -0,0 +1,5 @@
+If you want to make a more significant change, please first [open an
+issue](https://github.com/twpayne/chezmoi/issues/new) to discuss the change that
+you want to make. Dave Cheney gives a [good
+rationale](https://dave.cheney.net/2019/02/18/talk-then-code) as to why this is
+important.