fix rst errors

README.rst

@@ -58,7 +58,7 @@ format: ``v{calendar_version}.{build_number}[-{release_tag}]``
 Some examples:
 
 
-.. code-block::
+.. code-block:
 
     v201711.0001-alpha
     v201712.0027-beta
@@ -288,10 +288,6 @@ not be included in your patterns.
 A further restriction is, that a version string cannot span
 multiple lines in your source file.
 
-
-Pattern Search and Replacement
-------------------------------
-
 Now we can call ``pycalver bump`` to bump all occurrences of
 version strings in these files. Normally this will change local
 files, but the ``--dry`` flag will instead display a diff of the
@@ -573,6 +569,8 @@ from pkg_resources import parse_version
 The Life of a Library
 ---------------------
 
+.. code-block:
+
     mylib      v201711.001-alpha     # birth of a project (in alpha)
     mylib      v201711.002-alpha     # new features (in alpha)
     mylib      v201712.003-beta      # bugfix release (in beta)
@@ -601,6 +599,7 @@ mylib2     v203202.16052          # stable release
     v202008.508    # zero padding is added only after the turnover to
     v202009.0509   # a new month, so that lexical ordering is preserved.
 
+
 The date portion of the version, gives the user an indication of
 how up their dependency is, whether or not a project is still
 being maintained.