Merge pull request #1988 from shibisuriya/shibi-patch

Updated hyperlink in API doc for cellHeight

Author: adumesny

doc/README.md

@@ -80,7 +80,7 @@ gridstack.js API
 - `auto` - if `false` gridstack will not initialize existing items (default: `true`)
 - `cellHeight`- one cell height (default?: 'auto'). Can be:
    *  an integer (px)
-   *  a string (ex: '100px', '10em', '10rem'). Note: % doesn't right - see demo/cell-height.html
+   *  a string (ex: '100px', '10em', '10rem'). Note: % doesn't right - see [CellHeight](http://gridstackjs.com/demo/cell-height.html)
    *  0, in which case the library will not generate styles for rows. Everything must be defined in your own CSS files.
    *  `auto` - height will be calculated for square cells (width / column) and updated live as you resize the window - also see `cellHeightThrottle`
    *  `initial` - similar to 'auto' (start at square cells) but stay that size during window resizing.