badges, formatting, short example

README.md

@@ -1,7 +1,9 @@
 # Modern Julian Date
 
 [![npm (scoped)](https://img.shields.io/npm/v/@cityssm/modern-julian-date)](https://www.npmjs.com/package/@cityssm/modern-julian-date)
+[![DeepSource](https://app.deepsource.com/gh/cityssm/modern-julian-date.svg/?label=active+issues&show_trend=true&token=gVQq0XqtU1PZ2BWi_k-y1so9)](https://app.deepsource.com/gh/cityssm/modern-julian-date/)
 [![Code Climate maintainability](https://img.shields.io/codeclimate/maintainability/cityssm/modern-julian-date)](https://codeclimate.com/github/cityssm/modern-julian-date)
+[![codecov](https://codecov.io/gh/cityssm/modern-julian-date/graph/badge.svg?token=O2640MNNY0)](https://codecov.io/gh/cityssm/modern-julian-date)
 
 Converts a regular JavaScript date to the modern Julian date format YYYYDDD,
 commonly seen in banking applications.
@@ -15,14 +17,28 @@ npm install @cityssm/modern-julian-date
 ## Usage
 
 ```javascript
-import { toModernJulianDate } from "@cityssm/modern-julian-date";
+import {
+  toModernJulianDate,
+  toShortModernJulianDate
+} from "@cityssm/modern-julian-date";
+
+/*
+ * toModernJulianDate() returns date strings in YYYYDDD format.
+ */
 
 console.log( toModernJulianDate(new Date(2022, 1 - 1, 1)) );
-// => 2022001
+// => '2022001'
 
 console.log( toModernJulianDate(new Date(2022, 12 - 1, 31)) );
-// => 2022365
+// => '2022365'
 
 console.log( toModernJulianDate(new Date(2020, 12 - 1, 31)) );
-// => 2020366
+// => '2020366'
+
+/*
+ * toShortModernJulianDate() returns date strings in YYDDD format.
+ */
+
+console.log( toShortModernJulianDate(new Date(2022, 1 - 1, 1)) );
+// => '22001'
 ```