Merge pull request #98 from mojavelinux/document-automatic-lookbehind…

…-detection

document that lookbehind detection is automatic

README.md

@@ -317,7 +317,6 @@ The following options may be used with the main `picomatch()` function or any of
 | `ignore`              | `array\|string` | `undefined` | One or more glob patterns for excluding strings that should not be matched from the result. |
 | `keepQuotes`          | `boolean`      | `false`     | Retain quotes in the generated regex, since quotes may also be used as an alternative to backslashes.  |
 | `literalBrackets`     | `boolean`      | `undefined` | When `true`, brackets in the glob pattern will be escaped so that only literal brackets will be matched. |
-| `lookbehinds`         | `boolean`      | `true`      | Support regex positive and negative lookbehinds. Note that you must be using Node 8.1.10 or higher to enable regex lookbehinds. |
 | `matchBase`           | `boolean`      | `false`     | Alias for `basename` |
 | `maxLength`           | `boolean`      | `65536`     | Limit the max length of the input string. An error is thrown if the input string is longer than this value. |
 | `nobrace`             | `boolean`      | `false`     | Disable brace matching, so that `{a,b}` and `{1..3}` would be treated as literal characters. |
@@ -341,6 +340,8 @@ The following options may be used with the main `picomatch()` function or any of
 | `unescape`            | `boolean`      | `undefined` | Remove backslashes preceding escaped characters in the glob pattern. By default, backslashes are retained. |
 | `unixify`             | `boolean`      | `undefined` | Alias for `posixSlashes`, for backwards compatibility. |
 
+picomatch has automatic detection for regex positive and negative lookbehinds. If the pattern contains a negative lookbehind, you must be using Node.js >= 8.10 or else picomatch will throw an error.
+
 ### Scan Options
 
 In addition to the main [picomatch options](#picomatch-options), the following options may also be used with the [.scan](#scan) method.