feat: add support for specifying a format string

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Author: kgryte

lib/node_modules/@stdlib/plot/table/unicode/README.md

@@ -79,6 +79,8 @@ The constructor accepts the following `options`:
 
 -   **corners**: table corner grapheme clusters (i.e., visual characters) in the order `[top-left, top-right, bottom-right, bottom-left]`. This is a shorthand option instead of specifying corner character sequences individually. Default: `[ '┌', '┐', '┘', '└' ]`.
 
+-   **format**: cell [format][@stdlib/string/format] string(s). Default: `'%s'`.
+
 -   **headers**: table headers.
 
 -   **headerSeparator**: header separator character(s). Default: `'─'`.
@@ -423,6 +425,30 @@ var data = ndarray2array( table.data );
 
 The returned [ndarray][@stdlib/ndarray/ctor] is a **read-only** view of table data.
 
+<a name="prop-format"></a>
+
+#### UnicodeTable.prototype.format
+
+Cell [format][@stdlib/string/format] string(s) for rendering cell contents.
+
+```javascript
+var table = new UnicodeTable();
+
+// Set:
+table.format = '%d';
+
+// Get:
+var fmt = table.format;
+// returns '%d'
+
+// Set:
+table.format = [ '%s', '%d' ];
+
+// Get:
+fmt = table.format;
+// returns [ '%s', '%d' ]
+```
+
 <a name="prop-headers"></a>
 
 #### UnicodeTable.prototype.headers
@@ -1021,6 +1047,8 @@ console.log( str );
 
 [@stdlib/ndarray/ctor]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/ndarray/ctor
 
+[@stdlib/string/format]: https://github.com/stdlib-js/stdlib/tree/develop/lib/node_modules/%40stdlib/string/format
+
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