Sec-edgar-downloader

- Added support for [form 10KSB](https://www.vcexperts.com/definition/form-10-ksb).
- Added docs and tests to PyPI distribution package.
- Locked the `requests` dependency to `v2.22.0` or greater to ensure optimal performance and compatibility.

- `sec-edgar-downloader` is now fully documented 🎉. You can view the latest documentation at [sec-edgar-downloader.readthedocs.io](https://sec-edgar-downloader.readthedocs.io).
- Changed file encoding for filing downloads from `utf-8` to `ascii`. This switch was made because SEC filings should be [submitted in ASCII format](https://www.sec.gov/info/edgar/quick-reference/create-ascii-files.pdf).
- Locked the `lxml` dependency to `v4.3.4` or greater to fix Python 3.8 install issues.

- Added `before_date` parameter to each filing download method. If this value is not specified, it will default to the current date.
- Added `include_amends` parameter to each filing download method. If this value is not specified, it will default to false.
- Added support for passing relative (e.g. `./`, `../`) and user (e.g. `~/`) download paths to the `Downloader` constructor
- An `IOError` is no longer thrown when an invalid download path is passed to the `Downloader` constructor. Instead,`sec_edgar_downloader` will create all the necessary directories in the path if they do not exist.
- Filing documents are no longer downloaded in streamed chunks.
- Downloads are now written to disk with UTF-8 encoding.
- Added `__version__` variable to package.
- Travis CI now uses tox to lint and run tests.
- Added `verbose` flag to `Downloader` constructor to enable information printing (e.g. how many filings are found and downloaded). `verbose` will default to false, meaning that no download information will be printed by default.

- Cleaned up README
- Tweaked package naming in setup.py

- The method for obtaining 13F filings has been split up into two methods: one for obtaining 13F-NT filings and another one for obtaining 13F-HR filings
- You can read about the differences [here](https://www.sec.gov/divisions/investment/13ffaq.htm)
- You can now specify the number of filings to download in the `get_all_available_filings` method
- Simplified API by combining ticker and CIK functionality into a single method for each filing type
- Available methods: `get_8k_filings`, `get_10k_filings`, `get_10q_filings`, `get_13f_nt_filings`, `get_13f_hr_filings`, `get_sc_13g_filings`, `get_sd_filings`, `get_all_available_filings`
- All these methods can be passed either a CIK or ticker string
- Removed ticker validation to facilitate this simplified API change
- Added a full suite of unit and integration tests along with an internal Travis CI pipeline for increased reliability
- Class methods now return the number of filings downloaded
- Added Python 3.8 support

- Added the ability to specify the number of filings to download
- For example, you can download the latest 10-K for MSFT with this command: `downloader.get_10k_filing_for_ticker("MSFT", 1)`
- This is available for all non-bulk methods: `get_8k_filing_for_ticker`, `get_10k_filing_for_ticker`, `get_10q_filing_for_ticker`, `get_13f_filing_for_ticker`, `get_sc_13g_filing_for_ticker`, `get_sd_filing_for_ticker`, and the CIK equivalents