Update devel.adoc

KostyaSha · web-flow · commit 36d17ca42b9f · 2016-08-16T22:07:15.000+03:00
https://github.com/jenkinsci/credentials-plugin/blob/master/CONTRIBUTING.md
diff --git a/docs/devel.adoc b/docs/devel.adoc
@@ -13,6 +13,7 @@
   ** Provide full information on field:
   *** For models define API version with `@since {@link RemoteApiVersion#VERSION_1_X}`.
   ** getters/setters should refernce to field `@see #$field`.
+  * If it is `Serializable` it shall have a `serialVersionUID` field. Unless code has shipped to users, the initial value of the `serialVersionUID` field shall be `1L`.
 
 ### Coding style
   * TBD, some initial styling already enforced with checkstyle.
