Add recursive option for seeds (#284)

Related to knex/knex#3974

sections/seeds.js

@@ -17,8 +17,9 @@ export default [
     content: [
       "`directory`: a relative path to the directory containing the seed files. Can be an array of paths (default `./seeds`)",
       "`loadExtensions`: array of file extensions which knex will treat as seeds. For example, if you have typescript transpiled into javascript in the same folder, you want to execute only javascript seeds. In this case, set `loadExtensions` to `['.js']`  (Notice the dot!)  (default `['.co', '.coffee', '.eg', '.iced', '.js', '.litcoffee', '.ls', '.ts']`)",
+      "`recursive`: if true, will find seed files recursively in the directory / directories specified",
       "`specific`: a specific seed file to run from the seeds directory, if its value is `undefined` it will run all the seeds (default `undefined`)",
-      "`sortDirsSeparately`: if true and multiple directories are specified, all migrations from a single directory will be executed before executing migrations in the next folder (default `false`)"
+      "`sortDirsSeparately`: if true and multiple directories are specified, all seeds from a single directory will be executed before executing seeds in the next folder (default `false`)",
     ]
   },
   {