Fix readme monospace syntax

README.rst

@@ -189,11 +189,13 @@ installing it, or any dependencies, system-wide.
 To build the image:
 
 ::
+
     $ docker build -t pgcli .
 
 To create a container from the image:
 
 ::
+
     $ docker run --rm -ti pgcli pgcli <ARGS>
 
 To access postgresql databases listening on localhost, make sure to run the
@@ -201,12 +203,14 @@ docker in "host net mode". E.g. to access a database called "foo" on the
 postgresql server running on localhost:5432 (the standard port):
 
 ::
+
     $ docker run --rm -ti --net host pgcli pgcli -h localhost foo
 
 To connect to a locally running instance over a unix socket, bind the socket to
 the docker container:
 
 ::
+
     $ docker run --rm -ti -v /var/run/postgres:/var/run/postgres pgcli pgcli foo
 
 Thanks: