Update CHANGELOG.md

Signed-off-by: DeathsGun <deathsgun@protonmail.com>

Author: DeathsGun

CHANGELOG.md

@@ -3,6 +3,8 @@ Bugs fixed:
 - NullPointerException [#42](https://github.com/DeathsGun/ModManager/issues/42)
 - NullPointerException [#61](https://github.com/DeathsGun/ModManager/issues/64)
 - Forge versions shown as update [#56](https://github.com/DeathsGun/ModManager/issues/56)
+- Old versions not being deleted [#51](https://github.com/DeathsGun/ModManager/issues/51)
+- Mods shown outdated but there actually up to date [#52](https://github.com/DeathsGun/ModManager/issues/52)
 
 Improvements:
 
@@ -14,4 +16,5 @@ Improvements:
 - Continue scrolling in the mod list [#38](https://github.com/DeathsGun/ModManager/issues/38)
 - Show changelog, current version and target version before
   update [#41](https://github.com/DeathsGun/ModManager/issues/41)
-- Sort mods by relevance, downloads, updated and newest [#45](https://github.com/DeathsGun/ModManager/issues/45)
+- Sort mods by relevance, downloads, updated and newest [#45](https://github.com/DeathsGun/ModManager/issues/45)
+- Allows mods to disable update checking for their mod [#62](https://github.com/DeathsGun/ModManager/issues/62)