round legend title font size and increase it to all orientations

Author: archmoj

src/components/legend/attributes.js

@@ -191,8 +191,8 @@ module.exports = {
             description: [
                 'Sets this legend\'s title font.',
                 'Defaulted to `legend.font`.',
-                'When `orientation` is *h*, the size would be defaulted to be',
-                '20% greater than the font size used for legend items.'
+                'The size would be defaulted to be',
+                'around 20% greater than the font size used for legend items.'
             ].join(' '),
         }),
         side: {

src/components/legend/defaults.js

@@ -122,7 +122,7 @@ module.exports = function legendDefaults(layoutIn, layoutOut, fullData) {
     if(titleText) {
         coerce('title.side', isHorizontal ? 'left' : 'top');
         var dfltTitleFont = Lib.extendFlat({}, itemFont, {
-            size: itemFont.size * (isHorizontal ? 1.2 : 1)
+            size: Math.round(itemFont.size * 1.2)
         });
 
         Lib.coerceFont(coerce, 'title.font', dfltTitleFont);