misc: moved changelog agent to its own repo

Author: evilsocket

examples/changelog/README.md

@@ -1,8 +1 @@
-This agent will use git to determine the new commits since the last release in the current folder and generate a markdown changelog.
-
-Run from inside a git repository folder with:
-
-```bash
-# use with -q to only print the changelog markdown and disable logs
-nerve run examples/changelog -q
-```
+This agent now [live in its own repository](https://github.com/evilsocket/changelog).