ImproveDocs (Exonum Java Binding: Core 0.6.0 API)

```
@Documented
@Retention(SOURCE)
@Target({ANNOTATION_TYPE,TYPE,FIELD,METHOD,CONSTRUCTOR,PARAMETER})
public @interface ImproveDocs
```
Indicates that a documentation of a field, method or class needs to be improved (or added if absent).
Example usages:
- Certain aspects are under-documented or not-yet-known and need to be improved in the future.
- You need to urgently integrate a patch, but have not upgraded the documentation properly, and will do that ASAP. Such annotation is preferred to crude, inadequate comments.
- A badly documented code got into the project, and you had to dig deeply into implementation details to understand how to use it.
Do not leave this task unassigned!
It also works as a waiver for the CI server. Do not abuse.

- Required Element Summary
  
  Required Elements
  Modifier and Type Required Element Description
  
  String assignee
  Whom this item is assigned to.
- Optional Element Summary
  
  Optional Elements
  Modifier and Type Optional Element Description
  
  String reason
  A description of why this annotation was added.

- Element Detail
  - assignee
```
String assignee
```
    Whom this item is assigned to.
- - reason
```
String reason
```
    A description of why this annotation was added.
    
    Default:
    
    ""