docs: update matrix for v1.2.0

Author: thegamecracks

README.md

@@ -9,19 +9,20 @@ can be found [in their repository][2].
 
 ## Python compatibility
 
-|               | v1.0.0 | v1.0.1 | v1.0.4 | v1.1.0 | main |
-|---------------|:------:|:------:|:------:|:------:|:----:|
-| CPython 3.6   |   ✅   |   ✅   |   ✅   |  ❌  | ❌   |
-| CPython 3.7   |   ✅   |   ✅   |   ✅   |  ✅  | ✅   |
-| CPython 3.8   |   ✅   |   ✅   |   ✅   |  ✅  | ✅   |
-| CPython 3.9   |   ✅   |   ✅   |   ✅   |  ✅  | ✅   |
-| CPython 3.10  |   ✅   |   ✅   |   ✅   |  ✅  | ✅   |
-| CPython 3.11  |   ❌   |   ✅   |   ✅   |  ✅  | ✅   |
-| CPython 3.12  |   ❌   |   ❌   |   ✅   |  ✅  | ✅   |
-| CPython 3.13  |   ❌   |   ❌   |   ❌   |  ✅¹ | ✅¹  |
-| CPython 3.14+ |   ❌   |   ❌   |   ❌   |  ❌  | ❌   |
-
-¹ Free-threaded builds of CPython are not yet supported.
+|               | v1.0.0 | v1.0.1 | v1.0.4 | v1.1.0 | v1.2.0 | main |
+|---------------|:------:|:------:|:------:|:------:|:------:|:----:|
+| CPython 3.6   |   ✅   |   ✅   |   ✅   |  ❌  |  ❌   |  ❌  |
+| CPython 3.7   |   ✅   |   ✅   |   ✅   |  ✅  |  ❌   |  ❌  |
+| CPython 3.8   |   ✅   |   ✅   |   ✅   |  ✅  |  ✅   |  ✅  |
+| CPython 3.9   |   ✅   |   ✅   |   ✅   |  ✅  |  ✅   |  ✅  |
+| CPython 3.10  |   ✅   |   ✅   |   ✅   |  ✅  |  ✅   |  ✅  |
+| CPython 3.11  |   ❌   |   ✅   |   ✅   |  ✅  |  ✅   |  ✅  |
+| CPython 3.12  |   ❌   |   ❌   |   ✅   |  ✅  |  ✅   |  ✅  |
+| CPython 3.13  |   ❌   |   ❌   |   ❌   |  ✅¹ |  ✅¹  |  ✅¹ |
+| CPython 3.14  |   ❌   |   ❌   |   ❌   |  ❌  |  ✅   |  ✅  |
+| CPython 3.15+ |   ❌   |   ❌   |   ❌   |  ❌  |  ❌   |  ❌  |
+
+¹ CPython 3.13's experimental free-threading builds are not supported.
 
 ## Installation