feat: ogSiteName (#50)

Author: TheAlexLichter

Diff for: docs/modules/meta.md

@@ -67,6 +67,10 @@ Please read this resources before you enable `mobileAppIOS` option:
 - Default: `website`
 - Meta: `og:type`
 
+**ogSiteName**
+- Default: same as options.name
+- Meta: `og:site_name`
+
 **ogTitle**
 - Default: same as options.name
 - Meta: `og:title`

Diff for: packages/meta/index.js

@@ -31,6 +31,7 @@ function generateMeta (_options) {
     theme_color: this.options.loading && this.options.loading.color,
     lang: 'en',
     ogType: 'website',
+    ogSiteName: true,
     ogTitle: true,
     ogDescription: true,
     ogImage: true,
@@ -144,6 +145,13 @@ function generateMeta (_options) {
   if (options.ogTitle && !find(this.options.head.meta, 'property', 'og:title') && !find(this.options.head.meta, 'name', 'og:title')) {
     this.options.head.meta.push({ hid: 'og:title', name: 'og:title', property: 'og:title', content: options.ogTitle })
   }
+  // og:site_name
+  if (options.ogSiteName === true) {
+    options.ogSiteName = options.name
+  }
+  if (options.ogSiteName && !find(this.options.head.meta, 'property', 'og:site_name') && !find(this.options.head.meta, 'name', 'og:site_name')) {
+    this.options.head.meta.push({ hid: 'og:site_name', name: 'og:site_name', property: 'og:site_name', content: options.ogSiteName })
+  }
 
   // og:description
   if (options.ogDescription === true) {