Update changelog

Signed-off-by: Fabian Reinartz <freinartz@google.com>

CHANGELOG.md

@@ -1,16 +1,17 @@
 ## 2.3.0 / 2018-06-05
 
+* [CHANGE] `marathon_sd`: use `auth_token` and `auth_token_file` for token-based authentication instead of `bearer_token` and `bearer_token_file` respectively.
+* [CHANGE] Metric names for HTTP server metrics changed
 * [FEATURE] Add query commands to promtool
 * [FEATURE] Add security headers to HTTP server responses
 * [FEATURE] Pass query hints via remote read API
-* [CHANGE] `marathon_sd`: use `auth_token` and `auth_token_file` for token-based authentication instead of `bearer_token` and `bearer_token_file` respectively.
-* [ENHANCEMENT] Optimise PromQL for memory usage and allocations
+* [FEATURE] Basic auth passwords can now be configured via file across all configuration
+* [ENHANCEMENT] Optimise PromQL and API serialization for memory usage and allocations
 * [ENHANCEMENT] Limit number of dropped targets in web UI
-* [ENHANCEMENT] Add advanced filterting configuration to Consul service discovery
-* [ENHANCEMENT] Add advanced filterting configuration to EC2 service discovery
+* [ENHANCEMENT] Consul and EC2 service discovery allow using server-side filtering for performance improvement
+* [ENHANCEMENT] Add advanced filtering configuration to EC2 service discovery
 * [ENHANCEMENT] `marathon_sd`: adds support for basic and bearer authentication, plus all other common HTTP client options (TLS config, proxy URL, etc.)
 * [ENHANCEMENT] Provide machine type metadata and labels in GCE service discovery
-* [ENHANCEMENT] Use more efficient JSON encoder in API
 * [ENHANCEMENT] Add pod controller kind and name to Kubernetes service discovery data
 * [ENHANCEMENT] Move TSDB to flock-based log file that works with Docker containers
 * [BUGFIX] Properly propagate storage errors in PromQL
@@ -21,6 +22,8 @@
 * [BUGFIX] Make remote write more resilient to unavailable receivers
 * [BUGFIX] Make remote write shutdown cleanly
 * [BUGFIX] Don't leak files on errors in TSDB's tombstone cleanup
+* [BUGFIX] Unary minus expressions now removes the metric name from results
+* [BUGFIX] Fix bug that lead to wrong amount of samples considered for time range expressions
 
 ## 2.2.1 / 2018-03-13