docs(CHANGELOG): Fix RST format for code snippets

CHANGELOG.rst

@@ -4,42 +4,42 @@ Changelog
 1.13.0 (2018-11-14)
 -------------------
 
-- Use `isinstance(x, y)` instead of `type(x) == y`
+- Use ``isinstance(x, y)`` instead of ``type(x) == y``
-- Add a new `-f colored` option
+- Add a new ``-f colored`` option
 - Update documentation about colored output when run from CLI
 
 1.12.1 (2018-10-17)
 -------------------
 
-- Fix the `quoted-strings` rule, broken implementation
+- Fix the ``quoted-strings`` rule, broken implementation
-- Fix missing documentation for the `quoted-strings` rule
+- Fix missing documentation for the ``quoted-strings`` rule
 
 1.12.0 (2018-10-04)
 -------------------
 
-- Add a new `quoted-strings` rule
+- Add a new ``quoted-strings`` rule
 - Update installation documentation for pip, CentOS, Debian, Ubuntu, Mac OS
 
 1.11.1 (2018-04-06)
 -------------------
 
-- Handle merge keys (`<<`) in the `key-duplicates` rule
+- Handle merge keys (``<<``) in the ``key-duplicates`` rule
 - Update documentation about pre-commit
-- Make examples for `ignore` rule clearer
+- Make examples for ``ignore`` rule clearer
 - Clarify documentation on the 'truthy' rule
 - Fix crash in parser due to a change in PyYAML > 3.12
 
 1.11.0 (2018-02-21)
 -------------------
 
-- Add a new `octal-values` rule
+- Add a new ``octal-values`` rule
 
 1.10.0 (2017-11-05)
 -------------------
 
 - Fix colored output on Windows
 - Check documentation compilation on continuous integration
-- Add a new `empty-values` rule
+- Add a new ``empty-values`` rule
 - Make sure test files are included in dist bundle
 - Tests: Use en_US.UTF-8 locale when C.UTF-8 not available
 - Tests: Dynamically detect Python executable path
@@ -47,13 +47,13 @@ Changelog
 1.9.0 (2017-10-16)
 ------------------
 
-- Add a new `key-ordering` rule
+- Add a new ``key-ordering`` rule
 - Fix indentation rule for key following empty list
 
 1.8.2 (2017-10-10)
 ------------------
 
-- Be clearer about the `ignore` conf type
+- Be clearer about the ``ignore`` conf type
 - Update pre-commit hook file
 - Add documentation for pre-commit