Graduate to beta status.

I think it's OK now that the functionality is there, the usability is
there, it's well(-ish) tested.

README.rst

@@ -5,8 +5,6 @@ My Nagios plugin wrapper
     :target: https://git.shore.co.il/shore/mnpw/-/commits/master
     :alt: pipeline status
 
-*This software is in early development and is not intended for use yet.*
-
 The goal of this project is running Nagios plugins without a monitoring system.
 It is intended for my personal use as the warning and critical alerts go to `my
 notification mechanism <https://git.shore.co.il/nimrod/nextcloud-notifier>`_.

pyproject.toml

@@ -7,7 +7,7 @@ license = "MIT"
 homepage = "https://git.shore.co.il/shore/mnpw"
 repository = "https://git.shore.co.il/shore/mnpw"
 classifiers = [
-    "Development Status :: 3 - Alpha",
+    "Development Status :: 4 - Beta",
     "Environment :: Console",
     "Intended Audience :: Information Technology",
     "Intended Audience :: System Administrators",