fix typo: "SQLAchemy" -> "SQLAlchemy"

Update README.rst to fix typo: "SQLAchemy" -> "SQLAlchemy"

* Fetch table and column descriptions

* Reset coltype for unrecognized columns

* add tests

Co-authored-by: Tim Swast <swast@google.com>

Add MIT license headers via addlicense tool.

Following the recommended steps at
https://opensource.google/docs/releasing/preparing/ and
https://opensource.google/docs/releasing/authors/

… repo (#88)

* chore: add generated templates (via synthtool)

* use templated noxfile

* restore setup.cfg db section

autosynth cannot find the source of changes triggered by earlier changes in this
        repository, or by version upgrades to tools such as linters.

* test: update system test fixtures to create necessary tables

* revert changes to test file

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:
- [ ] Make sure to open an issue as a [bug/issue](https://github.com/googleapis/python-bigquery-sqlalchemy/issues/new/choose) before writing your code!  That way we can discuss the change, evaluate designs, and agree on the general idea
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Fixes #90  🦕

This should avoid race conditions when creating views from recently
(re)created tables.

Source-Author: Dan Lee <71398022+dandhlee@users.noreply.github.com>
Source-Date: Tue Mar 30 19:36:37 2021 -0400
Source-Repo: googleapis/synthtool
Source-Sha: 4501974ad08b5d693311457e2ea4ce845676e329
Source-Link: googleapis/synthtool@4501974

* refactor: consolidate BigQuery client creation and set user-agent

* add tests for default project logic

* use google-auth >=1.2.0 for AnonymousCredentials support

* bump minimum google-cloud-bigquery version

)

* fix: avoid 404 if dataset is deleted while listing tables or views

* add unit tests

* remove unnecessary bigquery import

🤖 I have created a release \*beep\* \*boop\*
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### [0.5.1](https://www.github.com/googleapis/python-bigquery-sqlalchemy/compare/v0.5.0...v0.5.1) (2021-04-01)


### Bug Fixes

* avoid 404 if dataset is deleted while listing tables or views ([#106](https://www.github.com/googleapis/python-bigquery-sqlalchemy/issues/106)) ([db379d8](https://www.github.com/googleapis/python-bigquery-sqlalchemy/commit/db379d850b916149db5976689d6f2323d2281f7a))


### Documentation

* add templates for move to googleapis/python-bigquery-sqlalchemy repo ([#88](https://www.github.com/googleapis/python-bigquery-sqlalchemy/issues/88)) ([37e584e](https://www.github.com/googleapis/python-bigquery-sqlalchemy/commit/37e584e05db6316b4abd41ebc08486047d2c49b8))
* build documentation with Sphinx ([#97](https://www.github.com/googleapis/python-bigquery-sqlalchemy/issues/97)) ([1707737](https://www.github.com/googleapis/python-bigquery-sqlalchemy/commit/1707737c60997e9714387c8077727eb5918626bb))
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