add autogenerated changelog (#4444)

##### Summary
<!--- Describe the change below, including rationale and design decisions -->
Create changelog based on GitHub labels
<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->

##### Component Name
<!--- Write the short name of the module or plugin below -->
GitHub management

##### Additional Information
<!--- Include additional information to help people understand the change here -->
<!--- A step-by-step reproduction of the problem is helpful if there is no related issue -->
Moving old manually created changelog to HISTORICAL_CHANGELOG.md and using command below to create changelog based on github issues, PRs, and labels. This is a preview and in the near future this will be automated and running daily in cron.

<!--- Paste log output below, e.g. before and after your change -->
```sh
docker run -it -v "$(pwd)":/project markmandel/github-changelog-generator:latest \
     --user "netdata" \
     --project "netdata" \
     --token "${GITHUB_TOKEN}" \
     --since-tag "v1.10.0" \
     --unreleased-label "**Next release**" \
     --no-compare-link \
     --exclude-labels duplicate,question,invalid,wontfix,discussion,documentation
```

1 files changed, 6 insertions, 0 deletions

diff --git a/.github/CODEOWNERS b/.github/CODEOWNERS
index 807775a989..8897f3214c 100644
--- a/.github/CODEOWNERS
+++ b/.github/CODEOWNERS
@@ -21,6 +21,12 @@ packaging/ @paulfantom
 # tests/
 # web/ 
 
+# Ownership by filetype (overwrites ownership by directory)
+*.am @paulfantom @ktsaou
+
+
+# Ownership of specific files
+CHANGELOG.md @netdatabot
 .travis.yml @paulfantom
 .lgtm.yml @paulfantom