doc fix to reflect v3.1 ga & pg18 now rc

Author: luss

README.md

@@ -4,7 +4,7 @@ Multicorn2
 
 Multicorn Python3 Foreign Data Wrapper (FDW) for Postgresql.  Tested on Linux w/ Python 3.9-3.13 & Postgres 14-18.
 
-Our latest release, v3.1, supports thru pg18 (and has some testing against Python 3.13).
+Our latest prod release, v3.1, supports thru pg18 (and has some testing against Python 3.13).
 Newest versions of major linux distro's (Ubuntu 24.04 & EL10) ship with Python 3.12 so sticking with using 3.12 (instead of 3.13) is advised in the short run.
 Python 3.9 is already deprecated by the CPython community and will soon be unsupported by this extension; use 3.10 thru 3.12 instead.
 
@@ -57,9 +57,9 @@ source venv/bin/activate
 ### Download & Compile Postgres 14+ source code
 ```bash
 cd ~
-wget https://ftp.postgresql.org/pub/source/v18beta2/postgresql-18beta2.tar.gz
-tar -xvf postgresql-18beta2.tar.gz
-cd postgresql-18beta2
+wget https://ftp.postgresql.org/pub/source/v18.0/postgresql-18.0.tar.gz
+tar -xvf postgresql-18.0.tar.gz
+cd postgresql-18.0
 ./configure
 make
 sudo make install
@@ -68,10 +68,10 @@ sudo make install
 ### Download & Compile Multicorn2
 ```bash
 set PATH=/usr/local/pgsql/bin:$PATH
-cd ~/postgresql-18beta2/contrib
-wget https://github.com/pgsql-io/multicorn2/archive/refs/tags/v3.1beta1.tar.gz
-tar -xvf v3.1beta1.tar.gz
-cd multicorn2-3.1beta1
+cd ~/postgresql-18.0/contrib
+wget https://github.com/pgsql-io/multicorn2/archive/refs/tags/v3.1.tar.gz
+tar -xvf v3.1.tar.gz
+cd multicorn2-3.1
 make
 sudo make install
 ```
@@ -89,7 +89,7 @@ When using a pre-built Postgres installed using your OS package manager, you wil
 ### Install Dependencies for Building the Multicorn2 extension
 On Debian/Ubuntu systems:
 ```bash
-sudo apt install -y build-essential ... postgresql-server-dev-17
+sudo apt install -y build-essential ... postgresql-server-dev-18
 sudo apt install -y python3 python3-dev python3-setuptools python3-pip python-is-python3
 ```
 
@@ -102,9 +102,9 @@ sudo yum -y install git python3 python3-devel python3-pip
 
 ### Download & Compile Multicorn2
 ```bash
-wget https://github.com/pgsql-io/multicorn2/archive/refs/tags/v3.1beta1.tar.gz
-tar -xvf v3.1beta1.tar.gz
-cd multicorn2-3.1beta1
+wget https://github.com/pgsql-io/multicorn2/archive/refs/tags/v3.1.tar.gz
+tar -xvf v3.1.tar.gz
+cd multicorn2-3.1
 make
 sudo make install
 ```