add diff.yq.textconv for yaml & json files

gitconfig

@@ -36,6 +36,9 @@
 [diff "hexdump"]
 	textconv = od -t x1z --
 
+[diff "yq"]
+	textconv = yq --yaml-output --indentless-lists . --
+
 [diff "openssl-x509-text"]
 	textconv = "sh -c 'while openssl x509 -noout -text; do echo; done' <\"$1\" 2>&1"