Update README.txt

Typo and reStructuredText fix.
version/history update for 4.3b2-r3
Add note on sudo to README
plone standalone systemd service file
Update links to developer.plone.org
Merge pull request #3 from pauloxnet/patch-1

Update README.txt
Merge pull request #5 from svx/master

Update links to point to developer.plone.org
Merge pull request #4 from jens-na/master

systemd service file (standalone)
Fix url in comments of the precompiler part.
Merge pull request #6 from nueces/master

Fix url in comments.
Add pins for plone.recipe.precompiler and command
Update to 4.3rc1
Merge branch 'master' of github.com:plone/Installers-UnifiedInstaller
Add zeoserver address references to client sections. Fixes #13482
Update to r2
zopeskel is now in buildout.cfg
Add diazo command-line tools to develop.cfg
Fixed bad .rst title
Update for 4.3
Adapt to 4.3