retarget properties doc

Author: KotlinIsland

docs/basedpython/features/properties.md

@@ -1,10 +1,10 @@
 # properties
 
-> **STATUS: planned for version 0.2, not yet implemented.** the `var`
+> **STATUS: planned for version 0.0.1a3, not yet implemented.** the `var`
 > keyword, the `get`/`set` accessor block, `field`, `lateinit`, and the
 > `let x: T` accessor form described below are not yet recognized by the
 > parser. `let x: T = init` at class scope partially works as the
-> [modifier](modifiers.md) form. tracking item: properties v0.2
+> [modifier](modifiers.md) form. tracking item: properties v0.0.1a3
 
 basedpython gives classes Kotlin-style property syntax. `var` and `let`
 declare instance state with a single declaration site; custom `get`/`set`