Bump version to 0.1.6

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: sovanesyan

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "calendarchy"
-version = "0.1.5"
+version = "0.1.6"
 edition = "2024"
 
 [dependencies]