Merge branch 'fix/signup-without-email' into 'develop'

Allow account registration without an email

See merge request pleroma/pleroma!2246

diff --cc CHANGELOG.md
index 59f7dfcddadafe6d756748b72a23444fe4ffd9bc,462c7c2a3e5ae38ed58512c62afd69c3a2a55599..100228c6c8c3d7574cc44c23f00ce32f20e8bd46
--- 1/CHANGELOG.md
--- 2/CHANGELOG.md
+++ b/CHANGELOG.md
@@@ -38,8 -38,8 +38,9 @@@ The format is based on [Keep a Changelo
  - Rate limiter is now disabled for localhost/socket (unless remoteip plug is enabled)
  - Logger: default log level changed from `warn` to `info`.
  - Config mix task `migrate_to_db` truncates `config` table before migrating the config file.
+ - Allow account registration without an email
  - Default to `prepare: :unnamed` in the database configuration.
 +- Instance stats are now loaded on startup instead of being empty until next hourly job.
  <details>
    <summary>API Changes</summary>