[ci skip] Update readme and changelog

CHANGELOG.md

@@ -7,6 +7,15 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## [Unreleased]
 
+### Changed
+
+- `Handler` interface has changed. `ProcessTask` method takes two arguments `context.Context` and `*asynq.Task`
+
+### Added
+
+- `Client` can optionally schedule task with `asynq.Timeout(duration)` to specify timeout duration for task. Default is no timeout.
+- `asynqmon cancel [task id]` will send a cancelation signal to the goroutine processing the speicified task.
+
 ## [0.3.0] - 2020-02-04
 
 ### Added

README.md

@@ -11,8 +11,6 @@ It is backed by Redis and it is designed to have a low barrier to entry. It shou
 
 **Important Note**: Current major version is zero (v0.x.x) to accomodate rapid development and fast iteration while getting early feedback from users. The public API could change without a major version update before v1.0.0 release.
 
-[Quick Tour of Asynq (YouTube video)](https://www.youtube.com/watch?v=FzMJdddNcmA&t=62s)
-
 ![Gif](/docs/assets/demo.gif)
 
 ## Installation

tools/asynqmon/README.md

@@ -13,6 +13,7 @@ Asynqmon is a command line tool to monitor the tasks managed by `asynq` package.
   - [Enqueue](#enqueue)
   - [Delete](#delete)
   - [Kill](#kill)
+  - [Cancel](#cancel)
 - [Config File](#config-file)
 
 ## Installation
@@ -133,6 +134,18 @@ Example:
 
 Running the above command will move all **Retry** tasks to **Dead** state.
 
+### Cancel
+
+Command `cancel` takes a task ID and sends a cancelation signal to the goroutine processing the specified task.  
+You can obtain the task ID by running `ls` command.
+
+The task should be in "in-progress" state.
+Handler implementation needs to be context aware in order to actually stop processing.
+
+Example:
+
+    asynqmon cancel bnogo8gt6toe23vhef0g
+
 ## Config File
 
 You can use a config file to set default values for the flags.