Update mysql-apt-config version
The version of 0.8.7 will lead to the EXPKEYSIG error when running ```sudo apt-get update```.
Update the dep file to the latest one.
@@ -47,8 +47,8 @@ with various package managers.
1. Install the following to add the MySQL APT repository.
```
- wget https://dev.mysql.com/get/mysql-apt-config_0.8.7-1_all.deb
- sudo dpkg -i mysql-apt-config_0.8.7-1_all.deb
+ wget https://dev.mysql.com/get/mysql-apt-config_0.8.15-1_all.deb
+ sudo dpkg -i mysql-apt-config_0.8.15-1_all.deb
```
Select `<Ok>`.
