Add 7.3.1 release post

Author: AlbaHerrerias

docs/_posts/2022-11-11-pouchdb-7.3.1.md

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+---
+layout: post
+
+title: PouchDB 7.3.1
+author: Alba Herrerías
+
+---
+
+We're happy to announce the release of PouchDB 7.3.1, bringing in some fixes and dependency updates. For a full changelog from 7.3.0 to 7.3.1, please see [the releases page](https://github.com/pouchdb/pouchdb/releases) or view the [latest commits](https://github.com/pouchdb/pouchdb/compare/7.3.0...7.3.1). Some of the highlights:
+
+## Changelog
+
+### Bugfixes
+
+* [7db104c5](https://github.com/pouchdb/pouchdb/commit/7db104c56248738598feb7ca1f22bc3b7bbd69be) ([#8463](https://github.com/pouchdb/pouchdb/issues/8463)) - check if docFieldValue is also null value. typeof null returns object in javasctipy. Fixes a bug when querying against and array with a null value, $elemMatch and $allMatch.
+* [719502dc](https://github.com/pouchdb/pouchdb/commit/719502dc6a75851dce9d0a35e44929b25943588c) ([#8225](https://github.com/pouchdb/pouchdb/issues/8225)) - Added check for blob.type setter
+* [d5bb7bd6](https://github.com/pouchdb/pouchdb/commit/d5bb7bd6330339448f5918592bd69df78166bad2) ([#8389](https://github.com/pouchdb/pouchdb/pull/8389)) - `_id` was mappped to `data._id` instead of id
+* [bbeb7e55](https://github.com/pouchdb/pouchdb/commit/bbeb7e557658fb405b5cf91dec50a79faf5278a3) ([#8531](https://github.com/pouchdb/pouchdb/pull/8531)) - fix sorted find including deleted docs 
+
+### Testing
+
+* [87f27101](https://github.com/pouchdb/pouchdb/commit/87f27101d519fdfb47506546ef5c46c85d2c030a) Failing test for PR [#8389](https://github.com/pouchdb/pouchdb/pull/8389)
+* [45522f78](https://github.com/pouchdb/pouchdb/commit/45522f7853831d0c4b514c49c72e672c73a18e7e)  test([#8438](https://github.com/pouchdb/pouchdb/issues/8438)): add test for sort deleted docs
+
+### Dependency updates
+
+* [922f7b54](https://github.com/pouchdb/pouchdb/commit/922f7b54c9300f2597e5f796248e5f5edfbb8eab) ([#8470](https://github.com/pouchdb/pouchdb/pull/8470)) - fix: upgrade promise-polyfill from 8.2.0 to 8.2.3 
+
+### Other changes
+
+* [fa57c294](https://github.com/pouchdb/pouchdb/commit/fa57c2942103b60f2345fc89d5291eee75ee8a89) ([#8468](https://github.com/pouchdb/pouchdb/pull/8468)) Replace deprecated String.prototype.substr()
+* [5a52f2ce](https://github.com/pouchdb/pouchdb/commit/5a52f2cef7ef2276bf9435d3aec1fc7fccc90a78) ([#8343](https://github.com/pouchdb/pouchdb/pull/8343)) - Add contextual data to the error message of failing tryMap and tryReduce
+
+## Get in touch
+
+As always, we welcome feedback from the community and would love to hear what you think of this release as well as PouchDB's future direction. Please don't hesitate to [file issues](https://github.com/pouchdb/pouchdb/issues), [open discussions](https://github.com/pouchdb/pouchdb/discussions) or [get in touch](https://github.com/pouchdb/pouchdb/blob/master/CONTRIBUTING.md#get-in-touch). And of course, a big thanks to all of our [new and existing contributors](https://github.com/pouchdb/pouchdb/graphs/contributors)!