Revert "Account for letter-spacing and word-spacing css (#29)"

context.font does not expect letter spacing / word spacing argument.
See #30 for more details.

This reverts commit c4880ec.

Author: pablosichert

src/Truncate.js

@@ -141,9 +141,7 @@ export default class Truncate extends Component {
             style['font-weight'],
             style['font-style'],
             style['font-size'],
-            style['font-family'],
-            style['letter-spacing'],
-            style['word-spacing']
+            style['font-family']
         ].join(' ');
 
         canvas.font = font;