update version strings for 3.3.1

Merge pull request coreruleset#1831 from lifeforms/pl2-932200

Move 932200 to PL2

Merge pull request coreruleset#1771 from franbuehler/request-smugglin…

…g-body

Prevent bypass of rule 921110

headers: update for 3.3

CHANGES: update

update CHANGES for v3.2.0-rc3

CONTRIBUTORS: welcoming airween as a committer

Merge pull request coreruleset#1526 from spartantri/v3.2/dev

send-payload-pls.sh script

Merge pull request coreruleset#1526 from spartantri/v3.2/dev

send-payload-pls.sh script

Backports to v3.1/dev from v3.2/dev (incl. ReDoS fixes) and update ve…

…rsion

* Backport regex update in regexp-942260.data
* Backport rules updates to 942260 and 942490
* Backport regex update in regexp-942490.data
* Backporting new regexp-assemble-v2.pl
* Describe ReDoS fix backports in CHANGES
* Bugfix in 943120 (backport)
* Content-Type made case insensitive in 920240, 920400 (backport)
* Fix bug in 920470 (backport)
* Allow percent encoding in 920240 (backport)
* Fix bug in 920440 (backport)
* Reduce false positives in 921110 (backport)
* Updating version to 3.1.1, copyright year and contributors file