README - small changes - add some horizontal-rules

Helps with visual scannability when scrolling down the page

README.md

@@ -187,6 +187,8 @@ Try your own queries. Follow these rules:
 
 Read more about the programming languages queries below.
 
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 ## Command line client, cht.sh
 
 The cheat.sh service has its own command line client (`cht.sh`) that
@@ -342,6 +344,8 @@ To activate tab completion support for `cht.sh`, add the `:zsh` script to the *f
     $ # Open a new shell to load the plugin
 ```
 
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 ### Stealth mode
 
 Being used fully unnoticed is one of the most important property of any cheat sheet.
@@ -442,6 +446,8 @@ You can also use [`scoop`](https://github.com/lukesampson/scoop) command-line in
 scoop install cht
 ```
 
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 ## Self-Hosting
 
 ### Docker