Add #892 in_use slot-leak fix to 4.4.5 changelog

Merge pull request #887 from benoitc/release/4.4.4

Release 4.4.4

Merge pull request #885 from benoitc/release/4.4.3

Release 4.4.3

Release 4.4.2

Release 4.4.1

Release 4.4.0

Release 4.3.0

hackney 4.2.3

Release 4.2.2

hackney 4.2.1