fix: column definition in migration

migrations/sqlite3/4_machine_column.sql

@@ -1,11 +1,11 @@
 -- +migrate Up
 -- SQL in section 'Up' is executed when this migration is applied
 
-alter table users
-    add `machine` varchar(255);
+alter table heartbeats
+    add column `machine` varchar(255);
 
 -- +migrate Down
 -- SQL section 'Down' is executed when this migration is rolled back
 
-alter table users
+alter table heartbeats
     drop column `machine`;

models/user.go

@@ -37,7 +37,7 @@ func (s *Signup) IsValid() bool {
 }
 
 func validateUsername(username string) bool {
-	return len(username) >= 3
+	return len(username) >= 3 && username != "current"
 }
 
 func validatePassword(password string) bool {

version.txt

@@ -1 +1 @@
-1.8.1
+1.8.2