misc: update Changelog

CHANGELOG.md

@@ -2,6 +2,9 @@
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+* 2021/6/22: **[Balance]** Using rods on base floor tiles creates reinforced floors faster. by [PetMudstone](https://github.com/PetMudstone) in PR #[6842](https://github.com/unitystation/unitystation/pull/6842)
+* 2021/6/22: **[Balance]** Using rods on lattices now creates catwalks instantly. by [PetMudstone](https://github.com/PetMudstone) in PR #[6842](https://github.com/unitystation/unitystation/pull/6842)
+* 2021/6/22: **[Improvement]** Catwalks now turn into a lattice and drop a metal rod when cut with wirecutters or when destroyed. by [PetMudstone](https://github.com/PetMudstone) in PR #[6842](https://github.com/unitystation/unitystation/pull/6842)
 * 2021/6/21: **[Fix]** Fixes the drunk shader being upside-down for OpenGL machines (Linux and some mac) #4542 by [jamessimo](https://github.com/jamessimo) in PR #[6832](https://github.com/unitystation/unitystation/pull/6832)
 * 2021/6/21: **[Improvement]** Made the drunk view more tame like you are drunk and not tripping on antifreeze and mercury. by [jamessimo](https://github.com/jamessimo) in PR #[6832](https://github.com/unitystation/unitystation/pull/6832)
 * 2021/6/20: **[Balance]** Potassium chemical explosions will be nerfed until their math or base explosion math can be made to be more nuanced. by [pyrosshade](https://github.com/pyrosshade) in PR #[6830](https://github.com/unitystation/unitystation/pull/6830)