Added a changelog

CHANGELOG.md

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+# TShock for Terraria
+
+This is the rolling changelog for TShock for Terraria. Use past tense when adding new entries; sign your name off when you add or change something. This should primarily be things like user changes, not necessarily codebase changes unless it's really relevant or large.
+
+## Unreleased (slated for 5.0)
+
+* API: Modifed NetItem so that it's actually useful. (@MarioE)
+* Updated prebuilts (SQLite, JSON, MySQL) to latest versions. (@nicatronTg)
+* Added a minimum password length to prevent blank passwords. (@nicatronTg)
+* Modified item ban checks to provide which item is disabling a player in the logs. (@Enerdy)
+* API: Modified TSPlayer to store a user, and deprecated calls to TSPlayer.User.ID. (@WhiteXZ)
+* Modified chat color specs in config file to be int arrays rather than floats. (@nicatronTg)
+* Modified verbiage for ```/auth``` and ```/auth-verify``` to make it clearer how they operate. (@nicatronTg)
+* API: Added fuzzy name searching for users. (@WhiteXZ)
+* API: Fixed ```OnPlayerLogout``` not being fired when a player disconnects. (@nicatronTg)
+* API: Deprecated ```ValidString``` and ```SanitizeString``` methods in Utils. (@nicatronTg)
+* Added BCrypt password hashing and related systems for it. BCrypt replaces the old system using non-password hashing algorithms for storing passwords. It breaks implementations of the login code that were manually recreated, but is otherwise seamless in transition. (@nicatronTg)
+* API: Added ```User.VerifyPassword(string password)``` which verifies if the user's password matches their stored hash. It automatically upgrades a users' password to BCrypt if called and the password stored is not a BCrypt hash. (@nicatronTg)
+* API: Deprecated ```Utils.HashPassword``` and related password hashing functions as those are no longer needed for plugin access.