Py-bingads

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*To extend support for [Microsoft Audience Ads](https://docs.microsoft.com/en-us/bingads/guides/audience-ads), new bulk objects are added to the SDK for reading and writing Bulk file records e.g., BulkResponsiveAd and BulkResponsiveAdLabel.
*Added retries for the 117 throttling error if encountered while polling for the status of a bulk or reporting operation.

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*Added support for Bing Ads API Version 12. For more information, see [Migrating to Bing Ads API Version 12](https://docs.microsoft.com/en-us/bingads/guides/migration-guide).
*The version parameter is now required when creating each ServiceClient. Previously the version was optional and defaulted to version 11. The version parameter is moved to the second position between the service client name and the authorization data.
*The file_type parameter now defaults to 'Csv' as an *str* datatype instead of the DownloadFileType for BulkFileReader, BulkServiceManager, DownloadParameters and SubmitDownloadParameters. You can set 'Tsv' if you prefer the tab separated file format type.

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*Updated to support [Microsoft Account authentication in sandbox](https://docs.microsoft.com/en-us/bingads/guides/sandbox.mdaccess).

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*The Bulk and Campaign Management proxies are updated to support [audience search size](https://docs.microsoft.com/en-us/bingads/guides/release-notesaudiencesearchsize-january2018). In addition the SDK supports audience search size via the BulkCustomAudience, BulkInMarketAudience, and BulkRemarketingList classes.

*Allow the Parent Id to be empty when deleting Bulk entities. Previously the Parent Id was required by the SDK although the Bulk service does not always require it.

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*The Version 11 Reporting service proxies are updated to support new columns for [Estimated Bids](https://docs.microsoft.com/en-us/bingads/guides/release-notesreporting-estimatedbids-november2017).

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* Support for version 9 and 10 ended on October 31st, 2017. The following version 9 and 10 proxies are now removed from the SDK. You must upgrade to version 11.
- Removed the Version 9 proxies for Customer Billing, Customer Management, and Reporting services. Also removed the Version 9 ReportingServiceManager.
- Removed the Version 10 proxies for Ad Insight, Bulk, and Campaign Management services. Also removed the Version 10 BulkServiceManager and Version 10 Bulk entities.
* The Version 11 Reporting service proxies are updated to support new columns for [Exact Match Impression Share Percent](https://docs.microsoft.com/en-us/bingads/guides/release-notesreporting-exactmatchimpressionshare-october2017) and [Labels](https://docs.microsoft.com/en-us/bingads/guides/release-notesreporting-labels-october2017).
* Improved memory usage for decompressing the bulk and report files.
* Set the default encoding to utf-8-sig and removed the chardet requirement. Bulk file download and upload should always be UTF-8 encoding with BOM.