Prepares CHANGELOG for v0.4.0 release (#97)

Signed-off-by: Christian Simon <[email protected]>

Author: simonswine

CHANGELOG.md

@@ -1,6 +1,6 @@
 # Changelog
 
-## unreleased / master
+## v0.4.0
 
 * [ENHANCEMENT] Loadgen: Allow users to selectively disable query or write loadgen by leaving their respective URL configs empty. #95
 * [FEATURE] Add overrides-exporter to cortextool, which exports Cortex runtime configuration overrides as metrics. #91

changelogs/v0.4.0.md

@@ -0,0 +1,18 @@
+# Changes
+
+* [ENHANCEMENT] Loadgen: Allow users to selectively disable query or write loadgen by leaving their respective URL configs empty. #95
+* [FEATURE] Add overrides-exporter to cortextool, which exports Cortex runtime configuration overrides as metrics. #91
+
+# Installation
+
+## cortextool
+```
+# download the binary (adapt os and arch as needed)
+$ curl -fSL -o "/usr/local/bin/cortextool" "https://github.com/grafana/cortex-tools/releases/download/v0.4.0/cortextool_0.4.0_linux_x86_64"
+
+# make it executable
+$ chmod a+x "/usr/local/bin/cortextool"
+
+# have fun :)
+$ cortextool --help
+```