fix: rework docs

README.md

@@ -35,11 +35,11 @@ bem-xjst engines accesible via properties `bemhtml` and `bemtree`:
 var engine = require('gulp-bem-xjst')[engine];
 ```
 
-### Plugin options
+### Options
 
-* *String* **exportName** — Engine handler's variable name. Default — `BEMHTML`.
-* *String* **engine** — Engine's name. Default — `BEMHTML`.
+* *String* **exportName** — Engine handler's variable name.
 * *String* **extension** — extension for file. Default — `.${engine}.js`.
+* *Object* **engine** — XJST [options](https://github.com/bem/bem-xjst/blob/master/docs/en/3-api.md#settings).
 
 ### License
 

index.js

@@ -10,7 +10,6 @@ var PluginError = require('plugin-error');
 var File = require('vinyl');
 var isStream = require('is-stream');
 var toArray = require('stream-to-array');
-var deprecate = require('depd')(require('./package.json').name);
 
 var formatError = require('./error');
 var bundle = require('./lib/templates/bundle');
@@ -21,25 +20,15 @@ var pluginName = path.basename(__dirname);
  * bem-xjst templates compiler.
  *
  * @param {Object} [options] - Options for generator.
- * @param {String} [options.extension] - File extension. Default: engine name. Deprecated. Please use instead
- * options.generator.extension
- * @param {Object} [options.generator] - Generator options.
- * @param {String} [options.generator.extension] - File extension. Default: engine name.
- * @param {Object} [options.engine] - Engine compiler options. @see
- * https://github.com/bem/bem-xjst/blob/master/docs/en/3-api.md#settings
+ * @param {String} [options.extension] - File extension. Default: engine name.
  * @param {String} [options.exportName] - Name for export. Please notice if you set this option generated code will
- * wrapped with CommonJS, YModules or Global
+ * @param {Object} [options.engine] - Engine compiler options. @see
+ * https://github.com/bem/bem-xjst/blob/master/docs/en/3-api.md#settings wrapped with CommonJS, YModules or Global
  * @param {String|Function} engine - 'bemhtml' either 'bemtree' or any xjst-like engine function.
  * @returns {Stream}
  */
 module.exports = function(options, engine) {
  options = options || {};
- options.generator = options.generator || {};
-
- if (options.extension) {
- deprecate('options.extension: is deprecated. Please use `options.generator.extension` instead.');
- options.generator = { extension: options.extension };
- }
 
  assert(typeof engine === 'string' || typeof (engine && engine.generate) === 'function', 'Invalid engine');