fix(plugin): don't hide sprite by default

ISSUES CLOSED: #232

Author: kisenka

README.md

@@ -208,8 +208,7 @@ It is also possible to generate sprite for each chunk by using `[chunkname]` pat
 <a id="plain-sprite"></a>
 ### Plain sprite
 
-You can render plain sprite in extract mode without styles, usages and hidden by default (`syle="position: absolute; width: 0; height: 0"`). 
-Pass `plainSprite: true` option to plugin constructor:
+You can render plain sprite in extract mode without styles and usages. Pass `plainSprite: true` option to plugin constructor:
 
 ```js
 {

lib/plugin.js

@@ -32,7 +32,6 @@ class SVGSpritePlugin {
     if (config.plainSprite) {
       spriteFactoryOptions.styles = false;
       spriteFactoryOptions.usages = false;
-      spriteFactoryOptions.attrs.style = ['position: absolute', 'width: 0', 'height: 0'].join('; ');
     }
 
     this.factory = ({ symbols }) => {