Add support for Erlang/OTP 27

Add OTP 27 to the github workflow yaml file. Supporting OTP 27 means
we no longer support OTP 22, so remove 22.x from the github yaml file
and fix README files, documentation, configure.ac and rebar.config to
require 23.0 as the minimum OTP version.

.github/workflows/main.yml

@@ -14,6 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         otp:
+          - "27.0"
           - "26.2"
           - "26.1"
           - "26.0"
@@ -29,10 +30,6 @@ jobs:
           - "23.2"
           - "23.1"
           - "23.0"
-          - "22.3"
-          - "22.2"
-          - "22.1"
-          - "22.0"
     runs-on: ubuntu-20.04
     steps:
       - name: Checkout Repo

README.md

@@ -23,7 +23,7 @@ Prepare build
 
 Get and install an Erlang system (http://www.erlang.org).
 
-**To compile Yaws, Erlang/OTP 22.0 or higher is required.**
+**To compile Yaws, Erlang/OTP 23.0 or higher is required.**
 
 If you've cloned the source from github and you want to build using autotools,
 note there is no ./configure script in the source, so create one:

README.osx

@@ -1,7 +1,7 @@
 # Homebrew on OSX
 
 If you develop on OS X, the Yaws formula works correctly for users of
-Erlang/OTP 22.0 and above. To install please run:
+Erlang/OTP 23.0 and above. To install please run:
 
     brew install yaws
 

configure.ac

@@ -235,10 +235,10 @@ dnl Get ERTS version.
 ERLANG_CHECK_ERTS
 ERLANG_CHECK_RELEASE
 
-dnl Require Erlang >=22.0 (ERTS 10.4) is required.
-AX_COMPARE_VERSION([${ERLANG_ERTS_VER}], [ge], [10.4],
+dnl Require Erlang >=23.0 (ERTS 11.0) is required.
+AX_COMPARE_VERSION([${ERLANG_ERTS_VER}], [ge], [11.0],
     [],
-    [AC_MSG_ERROR([Erlang 22.0 or higher is required but only Erlang $ERLANG_RELEASE was found!])])
+    [AC_MSG_ERROR([Erlang 23.0 or higher is required but only Erlang $ERLANG_RELEASE was found!])])
 
 dnl Determine directories for installation.
 if test "x${prefix}" != "xNONE" -a "x${ERLANG_INSTALL_LIB_DIR}" = "x"; then

doc/yaws.tex

@@ -193,7 +193,7 @@ \subsection{Compile and Install}
 
 To compile and install a \Yaws\  release
 one of the prerequisites is a properly installed \Erlang\  system. \Yaws\
-runs on \Erlang\/OTP releases 22.0 and newer. Get \Erlang\  from
+runs on \Erlang\/OTP releases 23.0 and newer. Get \Erlang\  from
 \url{http://www.erlang.org/}
 
 Compile and install is straight forward:

rebar.config

@@ -1,6 +1,6 @@
 %% -*- mode: erlang;erlang-indent-level: 4;indent-tabs-mode: nil -*-
 %% ex: ft=erlang ts=4 sw=4 et
-{require_min_otp_vsn, "22.0"}.
+{require_min_otp_vsn, "23.0"}.
 
 {sub_dirs, ["rel"]}.