* docs: update README to use declarative function signatures

Reduce redundancy in quickstart examples.

* Fix newline

Fix failing assert to look for a different error message, likely due to
a change in CloudEvents error message.

Also add tests so that code coverage is back at 100%.

This also handles bumping the version number in `setup.py` so that a separate
PR doesn't need to made.

When the GitHub Release is published by the Release Please app, it will
kick off the "Release to PyPI" Workflow.

See [functions-framework-conformance builidpack integration workflow PR](GoogleCloudPlatform/functions-framework-conformance#99) for more information.

* fix: Add functools.wraps decorator (#178)

To make sure function attributes are copied to `_http_view_func_wrapper`

Co-authored-by: Annie Fu <16651409+anniefu@users.noreply.github.com>

…tes in them (#187)

* Handle when attributes not present

Co-authored-by: Annie Fu <16651409+anniefu@users.noreply.github.com>

`mkdocs>=1.2.2` [depends on](https://github.com/mkdocs/mkdocs/blob/cdf8a26cafa6af6cc78a45766dfec235bd7286cc/setup.py#L69) `watchdog>=2.0` and the restriction of watchdog dependency for functions-framework-python done in #101 seems to be due [an issue related to watchdog built distributions](gorakhargosh/watchdog#689 (comment)) (as explained by @di) which is [now fixed](gorakhargosh/watchdog#807).

I propose to allow for `watchdog>=2.0.0` so that a project can use both `mkdocs>=1.2.2` (or `watchdog>=2.0.0`) and `functions-framework-python>=3.0.0`.

* feat: more detailed function target error message

Signed-off-by: Grant Timmerman <744973+grant@users.noreply.github.com>

* feat: more detailed function target error message (2)

Signed-off-by: Grant Timmerman <744973+grant@users.noreply.github.com>

* ci: fix tests

Signed-off-by: Grant Timmerman <744973+grant@users.noreply.github.com>

* ci: fix ci

Signed-off-by: Grant Timmerman <744973+grant@users.noreply.github.com>

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>