improve specification versioning

Signed-off-by: Onur Özkan <work@onurozkan.dev>

kaptan-spec/tests/ui/flight_core_contract.spec.md

@@ -0,0 +1,25 @@
+# --- version: 0.1.0 ---
+
+---
+title: Flight core contract
+status: in-progress
+owners:
+  - Flight Systems <flight@example.com>
+---
+
+## Contract
+
+Initial control contract.
+
+# --- version: 0.2.0 ---
+
+---
+title: Flight core contract
+status: implemented
+owners:
+  - Flight Systems <flight@example.com>
+---
+
+## Contract
+
+Revised control contract.