README: better formatting

README.md

@@ -7,8 +7,7 @@ This is based on [reverse-engineered MQTT message format](https://github.com/Dor
 
 Only tested on Linux and with my Bambu P1S 3D printer. This might require later firmware versions (mine is `01.06.00.00`) to function.
 
-Dependencies
----
+## Dependencies
 
 - Bash
 - Socat
@@ -16,13 +15,11 @@ Dependencies
 - jq
 - curl
 
-Installation
----
+## Installation
 
 This is a single script program. Download or symlink it anywhere you'd like.
 
-Configuration
----
+## Configuration
 
 Put the following content into `$XDG_CONFIG_HOME/bambu.conf.sh`:
 
@@ -32,8 +29,7 @@ BAMBU_SERIAL=<serial>
 BAMBU_ACCESS_CODE=<access_code>
 ```
 
-Usage
----
+## Usage
 
 For details, run `bambu.sh help`. Some examples: