[Feature] Website live chat (#187)

Co-authored-by: Nithin David Thomas <webofnithin@gmail.com>
Co-authored-by: Sojan Jose <sojan@pepalo.com>

db/migrate/20191024062958_add_website_token_to_web_widget.rb

@@ -0,0 +1,6 @@
+class AddWebsiteTokenToWebWidget < ActiveRecord::Migration[6.1]
+  def change
+    add_column :channel_web_widgets, :website_token, :string
+    add_index :channel_web_widgets, :website_token, unique: true
+  end
+end