Update Dovecot version from v2.2 to v2.4.

README

-Pigeonhole for Dovecot v2.2
+Pigeonhole for Dovecot v2.4
 
 Introduction
 ============

configure.ac

@@ -2,7 +2,7 @@ AC_PREREQ([2.59])
 
 # Be sure to update ABI version also if anything changes that might require
 # recompiling plugins. Most importantly that means if any structs are changed.
-AC_INIT([Pigeonhole], [0.6.devel], [dovecot@dovecot.org], [dovecot-2.2-pigeonhole])
+AC_INIT([Pigeonhole], [0.6.devel], [dovecot@dovecot.org], [dovecot-2.4-pigeonhole])
 AC_DEFINE_UNQUOTED([PIGEONHOLE_ABI_VERSION], "0.6.ABIv0($PACKAGE_VERSION)", [Pigeonhole ABI version])
 
 AC_CONFIG_AUX_DIR([.])

doc/man/doveadm-sieve.1.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH DOVEADM\-SIEVE 1 "2016-02-29" "Pigeonhole v0.4 for Dovecot v2.2" "Pigeonhole"
+.TH DOVEADM\-SIEVE 1 "2016-02-29" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .SH NAME
 doveadm\-sieve \- Commands related to handling Sieve scripts
 .\"------------------------------------------------------------------------

doc/man/pigeonhole.7.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH "PIGEONHOLE" 7 "2015-02-21" "Pigeonhole v0.4 for Dovecot v2.2" "Pigeonhole"
+.TH "PIGEONHOLE" 7 "2015-02-21" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .\"------------------------------------------------------------------------
 .SH NAME
 pigeonhole \- Overview of the Pigeonhole project\(aqs Sieve support for the

doc/man/sieve-dump.1.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH "SIEVE\-DUMP" 1 "2016-04-05" "Pigeonhole for Dovecot v2.2" "Pigeonhole"
+.TH "SIEVE\-DUMP" 1 "2016-04-05" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .\"------------------------------------------------------------------------
 .SH NAME
 sieve\-dump \- Pigeonhole\(aqs Sieve script binary dump tool

doc/man/sieve-filter.1.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH "SIEVE\-FILTER" 1 "2016-04-05" "Pigeonhole for Dovecot v2.2" "Pigeonhole"
+.TH "SIEVE\-FILTER" 1 "2016-04-05" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .SH NAME
 sieve\-filter \- Pigeonhole\(aqs Sieve mailbox filter tool
 

doc/man/sieve-test.1.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH "SIEVE\-TEST" 1 "2016-04-05" "Pigeonhole for Dovecot v2.2" "Pigeonhole"
+.TH "SIEVE\-TEST" 1 "2016-04-05" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .SH NAME
 sieve\-test \- Pigeonhole\(aqs Sieve script tester
 .\"------------------------------------------------------------------------

doc/man/sievec.1.in

 .\" Copyright (c) 2010-2018 Pigeonhole authors, see the included COPYING file
-.TH "SIEVEC" 1 "2016-04-05" "Pigeonhole for Dovecot v2.2" "Pigeonhole"
+.TH "SIEVEC" 1 "2016-04-05" "Pigeonhole for Dovecot v2.4" "Pigeonhole"
 .\"------------------------------------------------------------------------
 .SH NAME
 sievec \- Pigeonhole\(aqs Sieve script compiler