add .graceful method

ideas for better name please?!?! :)

index.js

@@ -18,3 +18,7 @@ module.exports = function (str) {
 
 	return crlf > lf ? '\r\n' : '\n';
 };
+
+module.exports.graceful = function (str) {
+	return module.exports(str) || '\n';
+};

readme.md

@@ -19,7 +19,16 @@ detectNewline('foo\nbar\nbaz\r\n');
 //=> '\n'
 ```
 
-Returns `null` when no newline character is found.
+
+## API
+
+### detectNewline(input)
+
+Returns detected newline or `null` when no newline character is found.
+
+### detectNewline.graceful(input)
+
+Returns detected newline or `\n` when no newline character is found.
 
 
 ## Related

test.js

@@ -7,4 +7,5 @@ test(t => {
 	t.is(m('foo\nbar\nbaz\r\n'), '\n');
 	t.is(m('foo\nbar\r\n'), '\n');
 	t.is(m('foo'), null);
+	t.is(m.graceful('foo'), '\n');
 });