getting rid of old change logs

[danielduan]

Issue:
Old changelogs are confusing, fixes #1557

[codecov]

Codecov Report

Merging #2145 into master will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff            @@
##           master   #2145      +/-   ##
=========================================
- Coverage   21.43%   21.4%   -0.04%     
=========================================
  Files         263     263              
  Lines        5803    5812       +9     
  Branches      686     693       +7     
=========================================
  Hits         1244    1244              
+ Misses       4047    4040       -7     
- Partials      512     528      +16

Impacted Files	Coverage Δ
app/vue/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/vue/src/server/babel_config.js	0% <0%> (-77.42%)	⬇️
addons/info/src/components/PropTable.js	21% <0%> (ø)	⬆️
lib/codemod/src/transforms/update-addon-info.js	49.01% <0%> (ø)	⬆️
lib/ui/src/modules/ui/configs/handle_keyevents.js	33.33% <0%> (ø)	⬆️
lib/ui/src/modules/ui/routes.js	0% <0%> (ø)	⬆️
.../ui/src/modules/ui/components/left_panel/header.js	29.62% <0%> (ø)	⬆️
lib/ui/src/modules/ui/containers/down_panel.js	23.52% <0%> (ø)	⬆️
addons/info/src/components/markdown/code.js	24.13% <0%> (ø)	⬆️
.../src/manager/containers/CommentsPanel/dataStore.js	34.97% <0%> (ø)	⬆️
... and 19 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 2d0e4ac...9527f5c. Read the comment docs.

[ndelangen]

@shilman do you agree?

[danielduan]

I'm just gonna merge this so we can close the PR. If you'd like it back, just hit the revert button.