add og:image

2018-05-14 19:31:46 +00:00 · 2018-05-14 19:31:46 +00:00 · b080911a39
--- a/img/greenlock-mark-400x400.png
+++ b/img/greenlock-mark-400x400.png
--- a/index.html
+++ b/index.html
@ -1,6 +1,7 @@
 <html>
  <head>
    <title>Greenlock&trade;</title>
+    <meta property="og:image" content="https://greenlock.ppl.family/img/greenlock-mark-400x400.png" />
  </head>
  <body hidden>
    <img width="410px" src="img/greenlock-820x150.png">