Release lading 0.29.0

This commit releases lading 0.29.0. Of primary interest we have
altered the capture manager subsystem so that historical metrics -- up
to one minute in the past -- may be submitted. This is taken advantage
of by the new Datadog intake blackhole, which supports in this release
v2 of the intake protocol.

Signed-off-by: Brian L. Troutwine <[email protected]>

Author: blt

CHANGELOG.md

@@ -4,7 +4,7 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
-## [unreleased]
+## [0.29.0]
 ## Changed
 - Kubernetes generator maximum lifetime seconds now expressed in `u32`, not
   `u64`.

Cargo.lock

@@ -1,6 +1,6 @@
 [package]
 name = "lading"
-version = "0.28.0"
+version = "0.29.0"
 authors = [
   "Brian L. Troutwine <[email protected]>",
   "George Hahn <[email protected]>",