Merge tag 'v1.9.2'

Merge tag 'v1.9.2'

Security hardening

Merge pull request fzaninotto#1865 from pimjansen/release/1.9.1

Added changelog for the 1.9.1 release

Bump version to 1.9

Update changelog for 1.8.0

Bump version

Prepare Release 1.7

Tagging 1.6.0

Merge pull request fzaninotto#585 from fzaninotto/prepare_1_5

Prepare 1.5 release