Uszipcode

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**Features and Improvements**

- Make Census 2020 data generally available for all zipcode.

**Minor Improvements**

**Bugfixes**

**Miscellaneous**

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**Features and Improvements**

- Drop Python2.7 support, now it is Python3.6+ only.
- Add Census 2020 data to the database for demographic statistics over time data points.

**Minor Improvements**

- Fully adopt type hint.
- Update docs and theme.

**Bugfixes**

- Fixed some zipcode attribute name typo.

**Miscellaneous**

- Update PyPI classifiers to reflect supported Python versions (3.6 through 3.9)
- Move CI to GitHub action.

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**Features and Improvements**

- Allow developer to use different download url in ``SearchEngine(..., download_url="your-own-download-url")``. So developer can upload the db file to a private file host server.
- Allow developer to use different database backend like mysql, postgres, oracle, mssql in ``SearchEngine(..., engine=custome_sqlachemy_engine)``. So developer can dump the sqlite to csv and load it to any database you want to use.

**Minor Improvements**

- rehost the database file on GitHub

**Bugfixes**

**Miscellaneous**

- Drop support < Python3.6, only support 3.6+

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**Bugfixes**

- fix compability issue with sqlachemy>=1.4.X

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**Features and Improvements**

- Now you can use ``SearchEngine(..., db_file_dir="/tmp")`` to specify where you want to put your database. By default it is ``${HOME}/.uszipcode``.

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**Miscellaneous**

- move the default download dir to /tmp folder, so this database can be used in AWS Lambda.