Update the changelog.

changelog.md

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+## Changes from 2.4.0 to 2.5.0
+
+### Highlights of this Release
+
+#### Support for Mesos 1.3.0
+Chronos now uses `libmesos` 1.3.0, which should be compatible with at least Mesos 1.3.x and 1.2.x.
+
+#### Updated many dependencies
+The versions of many dependencies were bumped.
+
+#### Added support for periods in job names
+The job names can now contain letters (`[a-zA-Z]`), digits (`[0-9]`), dashes (`-`), underscores
+(`_`), number signs (`#`), periods (`.`), and whitespace (`[ \t\n\x0B\f\r]`). They must match the
+following regular expression: `([\w\s\.#_-]+)`
+
+#### Better support for custom executors
+When using a custom executor, Chronos will now set the executor id to the job name and also include
+the URIs in the CommandInfo proto.
+
+#### Added support for specifying Docker parameters
+It is now possible to specify arbitrary Docker parameters.
+Check the [REST API documentation](https://mesos.github.io/chronos/docs/api.html) for more details.
+
+#### Changed the default framework name
+The framework name doesn't include the version number anymore.
+
+#### New API endpoints 
+The new `/scheduler/leader` endpoint makes it possible to get the current leader.
+
+It is now possible to mark a job as successful via the `/scheduler/job/success` API endpoint.
+
+If a job is marked successful, the success count +of the job is incremented, the latest successful
+run time is updated, and all downstream dependencies are handled as if the job had completed
+executing the code in a standard run.
+
+#### Improved constraints
+Chronos now supports the `UNLIKE` operator and it is possible to constraint jobs by hostname.
+
+#### Updates to the Dockerfile
+
+#### Various documentation improvements
+
+### Fixed Issues / Merged PRs
+- #497 - Don't allow proxying requests to self
+- #534 - Add framework ID to log
+- #535 - Allow periods in job names
+- #538 - Add support for Docker parameters
+- #539 - Fix Dockerfile so node works with Ubuntu base image
+- #540 - Extend documentation of `/scheduler/jobs` by the possibility to get a single job
+- #541 - Add info for `lastSuccess` and `lastError` to docs for listing jobs
+- #545 - Document the job name requirements
+- #550 - Add a warning to the README
+- #551 - Fixes #540 - Document Search Endpoint
+- #556 - [docs:api] Add clarity around values available for constraints
+- #562 - Fix #561, constraints are not activate with argument
+- #563 - Make it possible to constraint jobs by hostname
+- #566 - Bump specs2
+- #572 - Fix a formatting issue with api doc
+- #578 - Fix the job listing lastSuccess and error type
+- #583 - Add SCoverage for generating test coverage reports
+- #586 - Add Go client to docs
+- #587 - Cache maven artifacts with Travis
+- #589 - Add Chronos Shuttle to tools section
+- #595 - Add a `markJobSuccessful` API call
+- #602 - Set executor id to job name instead of static value
+- #603 - Add uris to the CommandInfo when a custom executor is set
+- #606 - Prevent jobs list from collapsing in small screens
+- #621 - Log a hint that constraints are not met for a task
+- #626 - Allow Chronos jobs to override taskInfo data
+- #629 - Add a job's run time and attempt as environment variables exposed to the job
+- #635 - Remove schedules from jobs made dependent when previously scheduled
+- #637 - Support Mesos fetcher cache (and other options)
+- #687 - Drop level of biggest logging offenders
+- #689 - Dedup ScheduleStream by jobName
+- #711 - Add headers required for CORS
+- #717 - Add support for overriding or adding arguments to a job
+- #741 - Add an API endpoint for getting the current leader
+- #749 - Support for username / password credentials for Cassandra
+- #804 - Add missing `MESOS_TASK_ID` environment variable
+
+
 ## Changes from 2.3.4 to 2.4.0
 
 ### Overview