fix: never-raises net widened to unexpected exceptions; changelog/429 docs (v0.1.4)

M-2: _attempt caught only (aiohttp.ClientError, asyncio.TimeoutError); an unexpected
error escaping the attempt (closed injected session -> RuntimeError, malformed proxy url
-> ValueError) propagated out of send(), breaking the documented 'never raises on a send
failure' contract. add an outer catch-all in _send_loop converting any such exception to a
falsy WebhookResult(ok=False), logged at warning with exc_info.

aiowebhooks-F3: README 429 section + changelog were stale vs the v0.1.3 'retry any 429'
fix; added the no-parseable-wait-still-retries wording and v0.1.3/v0.1.4 changelog entries.

verified by execution: closed-session (RuntimeError) and bad-proxy (ValueError) controls
both fire and now return ok=False instead of raising.

Signed-off-by: disqualifier <dev@disqualifier.me>

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "aiowebhooks"
-version = "0.1.3"
+version = "0.1.4"
 description = "async webhook sender (aiohttp) with round-robin urls, retry, and proxy rotation; optional discord.py embeds"
 requires-python = ">=3.10"
 dependencies = [