tweaked docs

CHANGELOG

@@ -1,5 +1,6 @@
 * 1.38.0 (2019-XX-XX)
 
+ * added max value to the "random" function
  * made namespace classes the default classes (PSR-0 ones are aliases now)
  * removed duplicated directory separator in FilesystemLoader
  * added Twig\Loader\ChainLoader::getLoaders()

doc/functions/random.rst

@@ -7,6 +7,9 @@
 .. versionadded:: 1.6
     String and integer handling was added in Twig 1.6.
 
+.. versionadded:: 1.38
+    The "max" argument was added in Twig 1.38.
+
 The ``random`` function returns a random value depending on the supplied
 parameter type:
 
@@ -28,5 +31,6 @@ Arguments
 ---------
 
 * ``values``: The values
+* ``max``: The max value when values is an integer
 
 .. _`mt_rand`: https://secure.php.net/mt_rand