Update README.md formatting

README.md

@@ -3,14 +3,14 @@
 This is a script to control 4-pin PWM fans on ASRock Rack motherboards with IPMI. The BMC does not properly expose fan control, so they must be controlled using raw IPMI commands. This script is a user-friendly way to do that.
 
 
-usage: asrock-pwm-ipmi [-h] [-i] [FAN:SPEED [FAN:SPEED ...]]
+    usage: asrock-pwm-ipmi [-h] [-i] [FAN:SPEED [FAN:SPEED ...]]
 
-Read information about and control fans on ASRock boards with IPMI.
+    Read information about and control fans on ASRock boards with IPMI.
 
-positional arguments:
-  FAN:SPEED   Fan to change the speed of, and the speed, separated by ':'. Set
-              to 0 for auto.
+    positional arguments:
+      FAN:SPEED   Fan to change the speed of, and the speed, separated by ':'. Set
+                  to 0 for auto.
 
-optional arguments:
-  -h, --help  show this help message and exit
-  -i, --info  Read fan information
+    optional arguments:
+      -h, --help  show this help message and exit
+      -i, --info  Read fan information