README.rst: Fixed formatting

No empty lines after a section title, 2 empty lines before a section title.
9 jobs for <span class="ref-name">378-make-bst-here-more-flexible</span> in 24 minutes and 52 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Prepare
passed #65233705
source_dist

00:03:46

 
  Test
passed #65233710
docs

00:03:49

passed #65233706
tests-debian-8

00:08:19

passed #65233707
tests-debian-9

00:17:41

passed #65233708
tests-fedora-27

00:12:04

passed #65233709
tests-unix

00:10:46

 
  Post
passed #65233712
analysis

00:00:51

passed #65233711
allowed to fail
codequality

00:03:24

passed #65233713
coverage

00:00:43

84.35%