Adds @adaex's contribution

Updates CHANGELOG

CHANGELOG.md

@@ -16,6 +16,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/) and this p
 
 ### Fixed
 
+- Fixes [#1511](https://github.com/eamodio/vscode-gitlens/issues/1511) - Avatars are blurry on retina displays — thanks to [PR #1595](https://github.com/eamodio/vscode-gitlens/pull/1595) by Adaex Yang ([@adaex](https://github.com/adaex))
 - Fixes [#1609](https://github.com/eamodio/vscode-gitlens/issues/1609) - X.globalState.setKeysForSync is not a function — thanks to [PR #1610](https://github.com/eamodio/vscode-gitlens/pull/1610) by Stanislav Lvovsky ([@slavik-lvovsky](https://github.com/slavik-lvovsky))
 - Fixes [#1131](https://github.com/eamodio/vscode-gitlens/issues/1131) - Order matters for search filters in 'search commits' — with help from [PR #1575](https://github.com/eamodio/vscode-gitlens/pull/1575) by Lior Kletter ([@Git-Lior](https://github.com/Git-Lior))
 - Fixes [#1583](https://github.com/eamodio/vscode-gitlens/issues/1583) - Should hide the context menu on unrelated tabs — thanks to [PR #1589](https://github.com/eamodio/vscode-gitlens/pull/1589) by Takashi Tamura ([@tamuratak](https://github.com/tamuratak))

README.md

@@ -1121,6 +1121,7 @@ A big thanks to the people that have contributed to this project:
 - Ivan Volzhev ([@ivolzhevbt](https://github.com/ivolzhevbt)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=ivolzhevbt)
 - x13machine ([@x13machine](https://github.com/x13machine)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=x13machine)
 - Ian Wilkinson ([@sgtwilko](https://github.com/sgtwilko)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=sgtwilko)
+- Adaex Yang ([@adaex](https://github.com/adaex)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=adaex)
 - Yan Zhang ([@Eskibear](https://github.com/Eskibear)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=Eskibear)
 - Zyck ([@qzyse2017](https://github.com/qzyse2017)) — [contributions](https://github.com/eamodio/vscode-gitlens/commits?author=qzyse2017)