Fixes added markes disappearing, outline/outline#897

Author: tommoor

src/marks.js

@@ -24,7 +24,7 @@ export default function renderMark(
       return <u>{props.children}</u>;
     case "deleted":
       return <del>{props.children}</del>;
-    case "added":
+    case "inserted":
       return <mark>{props.children}</mark>;
     default:
       return next();

src/plugins/MarkdownShortcuts.js

@@ -7,7 +7,7 @@ const inlineShortcuts = [
   { mark: "italic", shortcut: "*" },
   { mark: "italic", shortcut: "_" },
   { mark: "code", shortcut: "`" },
-  { mark: "added", shortcut: "++" },
+  { mark: "inserted", shortcut: "++" },
   { mark: "deleted", shortcut: "~~" },
 ];