Update README

Author: eemeli

README.md

@@ -4,22 +4,20 @@ A [PEG.js] parser for [ICU MessageFormat] strings – part of [messageformat.js]
 Outputs an AST defined by [parser.pegjs].
 
 The generated parser function takes two parameters, first the string to be
-parsed, and a second optional parameter `options`, an object.
-
-The options object contains arrays
-of keywords for `cardinal` and `ordinal` rules for the current locale – these
-are used to validate plural and selectordinal keys. If `options` or its fields
-are missing or set to false, the full set of valid [Unicode CLDR] keys is used:
-`'zero', 'one', 'two', 'few', 'many', 'other'`. To disable this check, pass in
-an empty array.
-
-The `options` object also supports a setting that makes the parser
-follow the ICU MessageFormat spec more closely: `strictFunctionParams`.
-
-By default, function parameters are split on commas and trimmed,
-so the parameters in `{x,fn,   a,   b   }` are parsed as `['a','b']`.
-Setting `strictFunctionParams` to true will result in a params array
-with a single element: `['   a,   b   ']`.
+parsed, and a second optional parameter `options`, an object with the following
+possible keys:
+
+- `cardinal` and `ordinal` – Arrays of valid plural categories for the current
+  locale, used to validate plural and selectordinal keys. If these are missing
+  or set to false, the full set of valid [Unicode CLDR] keys is used: `'zero',
+  'one', 'two', 'few', 'many', 'other'`. To disable this check, pass in an empty
+  array.
+
+- `strictFunctionParams` – By default, function parameters are split on commas
+  and trimmed, so the parameters in `{x,fn,   a,   b   }` are parsed as
+  `['a','b']`. Setting `strictFunctionParams` to true will make the parser
+  follow the ICU MessageFormat spec more closely, and result in a params array
+  with a single element: `['   a,   b   ']`.
 
 [ICU MessageFormat]: https://messageformat.github.io/guide/
 [messageformat.js]: https://messageformat.github.io/