Change jitter implementation

Decorrelated jitter has a major flaw: clamping. Retry intervals can get
repeatedly clamped to the maximum allowed duration. This effectively
removes any jitter.

The implementation in this library is a variation which exacerbates this
flaw.

This change replaces this jitter implementation with three options:

1. None
2. Full
3. Bounded

It also changes how 'maxiumum retry duration' is implemented. Before,
there was no information about how long the task had been retrying, so
there was no way to implement a correct 'maximum retry duration'.

This has been reimplemented to require a start time for a task when
setting a maxiumum retry duration.

CHANGELOG.md

@@ -1,19 +1,33 @@
 # Changelog
+
 All notable changes to this project will be documented in this file.
 
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
 
+## [0.2.0] - 2023-??-??
+
+### Changed
+
+- [Breaking] Jitter algorithm changed from a variation of decorrelated jitter to either none, full, or bounded.
+- [Breaking] Now requires a task start time when using a total retry duration.
+
 ## [0.1.2] - 2022-10-28
+
 ### Added
+
 - `Debug` derived for `RetryDecision`
 
 ## [0.1.1] - 2021-10-18
+
 ### Security
+
 - remove time v0.1 dependency
 
 ## [0.1.0] - 2021-08-11
+
 ### Added
+
 - `ExponentialBackoff` policy.

README.md

@@ -10,7 +10,7 @@ A collection of plug-and-play retry policies for Rust projects.
 Currently available algorithms:
 
 - [`ExponentialBackoff`](https://docs.rs/retry-policies/latest/retry_policies/policies/struct.ExponentialBackoff.html),
-  with decorrelated jitter.
+  with configurable jitter.
 
 ## How to install
 
@@ -19,7 +19,7 @@ Add `retry-policies` to your dependencies
 ```toml
 [dependencies]
 # ...
-retry-policies = "0.1.2"
+retry-policies = "0.2.0"
 ```
 
 #### License

src/lib.rs

@@ -2,4 +2,4 @@
 pub mod policies;
 mod retry_policy;
 
-pub use retry_policy::{RetryDecision, RetryPolicy};
+pub use retry_policy::{Jitter, RetryDecision, RetryPolicy};