Update version to 0.4.2

Author: sigma67

docs/source/setup.rst

@@ -10,8 +10,13 @@ To run authenticated requests you need to copy your request headers from a POST
 
 To do so, follow these steps:
 
-    - Copy ``headers_auth.json.example`` to ``headers_auth.json``
+    - Copy ``headers_auth.json.example`` (see below) to ``headers_auth.json``
     - Open YTMusic in Firefox
     - Go to the developer tools (Ctrl-Shift-I) and right click a POST request.
     - Copy the request headers (right click > copy > copy request headers)
-    - Paste the three missing items to `headers_auth.json`
+    - Paste the three missing items to `headers_auth.json`
+
+**headers_auth.json.example**
+
+.. literalinclude:: ../../headers_auth.json.example
+  :language: JSON

ytmusicapi/_version.py

@@ -1 +1 @@
-__version__ = "0.4.1"
+__version__ = "0.4.2"