Bump SDK version to 1.2.0, add changelog entry

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "interval-sdk"
-version = "1.1.0"
+version = "1.2.0"
 description = "The frontendless framework for high growth companies. Interval automatically generates apps by inlining the UI in your backend code. It's a faster and more maintainable way to build internal tools, rapid prototypes, and more."
 authors = [
 	"Jacob Mischka <[email protected]>",