* added tests environment with mongodb 4.4.3
* added CI test for mongodb 4.4.3
* added CI tests for MongoDB versions 4.0, 4.2
* improved flaky test (seems to max out the limit of simultaneous connections)
* added spec helpers to run tests only for specific MongoDB version
* addedn npm scripts to run tests against relevant mongodb versions
* added spec helper function to exclude specific mongodb version
* added test for changed aggregate query planner results
* fixed regex test with incorrect regex syntax
* fixed test where query has select no keys (empty array)
* added changelog entry and ordered list
* fixed test that tried to simultaneously delete and build index on same collection
* added MongoDB compatibility table to readme
* updated default local tests to use MongoDB 4.4.3
* added MongoDB badges for new versions to README
* fixed typo in readme
* added new test helper filter to contribution guide
* fixed incorrect storage engine for mongodb 4.4
* changed CI to test MongoDB 3.6. with mmapv1 storage engine and standalone
* improved CI test description
* added CI self check for new MongoDB versions
* fixed CI
* removed CI
* added CI
* added throwing error if any of the checks failed
* added github action connector
* improved error message
* improved error messages
* improved error message
* updated CI environment to MongoDB 3.6.22
* improved error messages
* update CI env name
* updated CI env name
* improved error message
* removed patch versions from CI env description
* improved status message
* removed version range from core lib
* added explicit mongodb version to redis test and node 12 test
* bumped Node 12 test to 12.20.1 (version currently recommended by AWS Elastic Beanstalk)
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