Allow exit codes from 125 to 255

Author: ehmicky

CHANGELOG.md

@@ -1,3 +1,9 @@
+# 5.1.0
+
+## Features
+
+- Allow [exit codes](README.md#-exitcode) from 125 to 255.
+
 # 5.0.1
 
 ## Documentation

README.md

@@ -105,7 +105,12 @@ _Default_: `1`
 
 Process [exit code](https://en.wikipedia.org/wiki/Exit_status).
 
-Note: when passing invalid `options`, the exit code is always `125`.
+We recommend values between 1 and 124 because the following exit codes have some
+special meaning:
+
+- 0: success
+- 125: invalid [`options`](#options)
+- 126 to 255: used by shells like Bash
 
 ### 📕 stack