README.rst: fix formatting

Fix formatting blooper introduced in https://github.com/matrix-org/synapse/pull/1672 :/

README.rst: fix formatting
6f5e41e4 · Richard van der Hoff · GitHub · 0d37a7bf · 6f5e41e4
Commit 6f5e41e4 authored 8 years ago by Richard van der Hoff Committed by GitHub 8 years ago
--- a/README.rst
+++ b/README.rst
@@ -138,6 +138,7 @@ Installing prerequisites on openSUSE::
                   python-devel libffi-devel libopenssl-devel libjpeg62-devel

 Installing prerequisites on OpenBSD::
+
    doas pkg_add python libffi py-pip py-setuptools sqlite3 py-virtualenv \
                 libxslt