CHANGELOG: remove unupdated changelog file

We have been putting the changelog in the tags. Nuke this file.

CHANGELOG

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-v0.4.6
-* Fix long-term timer leak (#900, #875, #868, #904)
-* Fix `Running` field in standby_info file (#881)
-* Add `quorum=true` query parameter for GET requests (#866, #883)
-* Add `Access-Control-Allow-Headers` header for CORS requests (#886)
-* Various documentation improvements (#907, #882)
-
-v0.4.5
-* Flush headers immediately on `wait=true` requests (#877)
-* Add `ETCD_HTTP_READ_TIMEOUT` and `ETCD_HTTP_WRITE_TIMEOUT` (#880)
-* Add `ETCDCTL_PEERS` configuration to etcdctl (#95)
-* etcdctl takes stdin for mk (#91)
-
-v0.4.4
-* Fix `--no-sync` flag in etcdctl (#83)
-* Improved logging for machine removal (#844)
-* Various documentation improvements (#858, #851, #847)
-
-v0.4.3
-* Avoid panic() on truncated or unexpected log data (#834, #833)
-* Fix missing stats field (#807)
-* Lengthen default peer removal delay to 30mins (#835)
-* Reduce logging on heartbeat timeouts (#836)
-
-v0.4.2
-* Improvements to the clustering documents
-* Set content-type properly on errors (#469)
-* Standbys re-join if they should be part of the cluster (#810, #815, #818)
-
-v0.4.1
-* Re-introduce DELETE on the machines endpoint
-* Document the machines endpoint
-
-v0.4.0
-* Introduced standby mode
-* Added HEAD requests
-* Set logs NOCOW flag when BTRFS is detected to avoid fsync overhead
-* Fix all known data races, and pass Go race detector (TODO: re-run race detector)
-* Fixed timeouts when using HTTPS
-* Improved snapshot stability
-* Migration of machine names to new IPs
-* Updated peer discovery ordering
-
-v0.3.0
-* Add Compare-and-Delete support.
-* Added prevNode to response objects.
-* Added Discovery API.
-* Add tracing and debug endpoints (Documentation/debugging.md).
-* Improved logging of cluster events.
-* go get github.com/coreos/etcd works.
-* info file is no longer used.
-* Snapshots are on by default.
-* Statistics APIs documented.
-
-v0.2.0
-* Support directory creation and removal.
-* Add Compare-and-Swap (CAS) support.
-* Support recursive GETs.
-* Support fully consistent GETs.
-* Allow clients to watch specific paths.
-* Allow clients to watch for key expiration.
-* Unique key generation.
-* Support hidden paths.
-* Refactor low-level data store.
-* Modularize store, server and API code.
-* Integrate Gorilla Web Toolkit.
-* Add tiered configuration (command line args, env variables, config file).
-* Add peer protocol versioning.
-* Add rolling upgrade support for future versions.
-* Sync key expiration across cluster.
-* Significantly improve test coverage.
-* Improve migration testing.
-* Configurable snapshot count.
-* Reduce TCP connection count.
-* Fix TCP connection leak.
-* Bug Fixes: https://github.com/coreos/etcd/issues?milestone=1&state=closed
-
-Contributors:
-* Xiang Li (@xiangli-cmu)
-* Ben Johnson (@benbjohnson)
-* Brandon Philips (@philips)
-* Yifan (@yifan-gu)
-* Rob Szumski
-* Hongchao Deng (@fengjingchao)
-* Kelsey Hightower (@kelseyhightower)
-* Adrián (@adrianlzt)
-* Antonio Terreno (@aterreno)