fixup! fixup! fixup! fixup! Support for jsonformat in duration deseri…

…alizer based on Duration::of(long,TemporalUnit). ref FasterXML#184

datetime/README.md

@@ -47,6 +47,17 @@ times but are supported with this module nonetheless.
 [`LocalDateTime`](https://docs.oracle.com/javase/8/docs/api/java/time/LocalDateTime.html), and
 [`OffsetTime`](https://docs.oracle.com/javase/8/docs/api/java/time/OffsetTime.html), which cannot portably be converted to
 timestamps and are instead represented as arrays when `WRITE_DATES_AS_TIMESTAMPS` is enabled.
+* [`Duration`](https://docs.oracle.com/javase/8/docs/api/java/time/Duration.html), which unit can be configured in `JsonFormat` using a [`ChronoUnit`](https://docs.oracle.com/javase/8/docs/api/java/time/temporal/ChronoUnit.html) as `pattern`. For instance:
+    ```java
+    @JsonFormat(pattern="MILLIS")
+    long millis;
+
+    @JsonFormat(pattern="SECONDS")
+    long seconds;
+
+    @JsonFormat(pattern="DAYS")
+    long days;
+    ```
 
 ## Usage