Add missing catch blocks for migration from 1.1.1 to 1.2.0

Signed-off-by: Hugo Caloto <hcaloto@gmail.com>

lib/migrations/20161009040430-support-delete-note.js

@@ -1,7 +1,13 @@
 'use strict'
 module.exports = {
   up: function (queryInterface, Sequelize) {
-    return queryInterface.addColumn('Notes', 'deletedAt', Sequelize.DATE)
+    return queryInterface.addColumn('Notes', 'deletedAt', Sequelize.DATE).catch(function (error) {
+      if (error.message === "ER_DUP_FIELDNAME: Duplicate column name 'deletedAt'") {
+        console.log('Migration has already run… ignoring.')
+      } else {
+        throw error
+      }
+    })
   },
 
   down: function (queryInterface, Sequelize) {