Remove outdated changelog file

This hasn't been updated in 2 years and we have CHANGELOG.md now.
3 jobs for chore/remove-outdated-changelog in 8 minutes and 56 seconds (queued for 1 second)
Status Job ID Name Coverage
  Lint
passed #78317
lint

00:01:11

 
  Build
passed #78318
build

00:01:49

 
  Test
failed #78319
test

00:05:55

 
Name Stage Failure
failed
test Test
npm ERR! pleroma_fe@1.0.0 unit: `karma start test/unit/karma.conf.js --single-run`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the pleroma_fe@1.0.0 unit script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! /root/.npm/_logs/2019-11-15T20_06_40_295Z-debug.log
ERROR: Job failed: exit code 1