chore: bump version for release

Amp-Thread-ID: https://ampcode.com/threads/T-019da253-12c2-7471-9c7d-cf5ce1fbfb28
Co-authored-by: Amp <amp@ampcode.com>

Author: alDuncanson

pyproject.toml

@@ -1,6 +1,6 @@
 [project]
 name = "a2a-handler"
-version = "0.1.18"
+version = "0.1.19"
 description = "An A2A Protocol client TUI and CLI."
 readme = "README.md"
 requires-python = ">=3.11"