Refactor packaging to pyproject.toml and update README

Author: mark9064

README.md

@@ -1,10 +1,18 @@
 # factorio-rcon-py
 
-A simple factorio RCON client
+A simple Factorio RCON client
 
 ## Install
 
-`pip3 install factorio-rcon-py`
+Without async support
+`pip install factorio-rcon-py`
+
+With async support
+`pip install factorio-rcon-py[async]`
+
+Async support is available as soon as the required dependency (anyio) is installed, so `pip install factorio-rcon-py anyio` is mostly equivalent, but not recommended due to dependency versioning.
+
+Python 3.7+ is required.
 
 ## Usage
 
@@ -16,20 +24,19 @@ client = factorio_rcon.RCONClient("127.0.0.1", 12345, "mypassword")
 response = client.send_command("/help")
 ```
 
-All documentation is in the docstrings of each function/class. Currently,
-there is no docs website or similar but one is planned.
+All documentation is in the docstrings of each class/method.
 
-Asynchronous usage of this module is possible thanks to [anyio](https://github.com/agronholm/anyio). This means that you can use the async client with asyncio, curio and trio. Use the AsyncRCONClient class. More details are in its docstring.
+Asynchronous usage of this module is possible thanks to [anyio](https://github.com/agronholm/anyio). This means that you can use the async client with asyncio and trio. Use the AsyncRCONClient class. More details are in its docstring.
 
-Available functions in both classes are (see docstrings for more info):
+Available methods in both classes are (see docstrings for more info):
 * connect - Connects to the RCON server.
 * close - Closes the connection to the RCON server.
 * send_packet - Sends a packet to the RCON server.
-* receive_packets - Receives a variable number of packets from the RCON server.
+* receive_packet - Receives a packet from the RCON server.
 * send_command - Sends a single command to the RCON server.
 * send_commands - Sends multiple commands to the RCON server.
 
-The functions for sending/receiving packets are available in case you want to
+The methods for sending/receiving packets are available in case you want to
 write your own packet handlers, but in most cases you will never need to touch
 these and can use send_command(s).
 

optional-requirements.txt

@@ -0,0 +1,30 @@
+[build-system]
+requires = ["setuptools>=62.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "factorio-rcon-py"
+version = "2.0.0"
+description = "A simple Factorio RCON client"
+dependencies = []
+readme = "README.md"
+requires-python = ">=3.7"
+license = {file = "LICENSE"}
+authors = [
+    {name = "mark9064"}
+]
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: GNU Lesser General Public License v2 (LGPLv2)",
+    "Operating System :: OS Independent",
+    "Development Status :: 4 - Beta",
+    "Natural Language :: English"
+]
+
+[project.optional-dependencies]
+async = [
+    "anyio>=3.0, <4.0"
+]
+
+[project.urls]
+homepage = "https://github.com/mark9064/factorio-rcon-py"