Add v2.4.0 update account news blog entry

blog/v2_4_0-update.md

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+---
+title: Update to v2.4.0
+description: More about the upcoming version
+slug: v2_4_0-update
+authors: konstantin
+tags: [hello, welcome, noten-app, post, first]
+hide_table_of_contents: false
+---
+
+We have finished development of v2.4.0 and will be releasing it soon.
+
+This version will include a new year-system which will allow you to have multiple years in one account containing all grades, subjects and homework tasks in that year.
+
+<!-- truncate -->
+
+## Migration
+
+Because we added a new year-system all your current grades will be moved to one year with a random name. You can a
+change that name in the settings.
+
+We will not (as planned) migrate your account when opening it after the update, but instead we will migrate all accounts at once on our servers.
+
+This migration is planned to be happening between the 29th and the 31st of December.
+
+As the migration will take some time you might not be able to access your account during that time.
+
+### E-Mails
+
+Because new accounts are required to verify their E-Mail-Address we will also require all existing accounts to verify their E-Mail-Address.
+
+When logging in after the update you will be asked to verify your E-Mail-Address.
+
+You can still use your account without verifying your E-Mail-Address **until around the end of January**, but after that you will not be able to use your account anymore until you verify your E-Mail-Address.