Add @localhost to last MySQL command (#296)

It's been a long time since I remembered MySQL user naming convention stuff, but, just empirically I get the following error following the README instructions:

```
mysql -u root
```

```
mysql> GRANT ALL ON esqutest.* TO 'travis';
ERROR 1410 (42000): You are not allowed to create a user with GRANT
mysql> GRANT ALL ON esqutest.* TO 'travis'@'localhost';
Query OK, 0 rows affected (0.00 sec)
```

MySQL version:

```
~/D/C/H/esqueleto> mysql --version                                                                                                                                                                                                                                                                                                                                  12:38:37
mysql  Ver 8.0.22 for osx10.15 on x86_64 (Homebrew)
```
This commit is contained in:
Maximilian Tagher 2022-03-10 09:34:08 -05:00 committed by GitHub
parent c70799be09
commit 101a87f936
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@ -488,5 +488,5 @@ user which can access it:
mysql> CREATE DATABASE esqutest;
mysql> CREATE USER 'travis'@'localhost';
mysql> ALTER USER 'travis'@'localhost' IDENTIFIED BY 'esqutest';
mysql> GRANT ALL ON esqutest.* TO 'travis';
mysql> GRANT ALL ON esqutest.* TO 'travis'@'localhost';
```