Fixed incorrectly inserting role to YAML

[intagaming]

Fixes #28

[intagaming]

Sorry for that double commit... For some reason "targetMember", although not plural, is required to be an array. I didn't figure out the inner meaning and intention yet, but it also fixes a problem when the /info Form is not working with the Member & Role options.

[suerion]

So, Roles are already Fixed, Branch is okey ;) i had tried it again with dev Tools, he has 1 File not saved.

Next Problem with Already given Players, this thing is already in HRK Migrator

[06:44:44] [Server thread/CRITICAL]: ErrorException: "Invalid argument supplied for foreach()" (EXCEPTION) in "plugins/HRKMigrator_dev-3.phar/src/CortexPE/HRKMigrator/Main" at line 165
[06:44:44] [Server thread/DEBUG]: #0 plugins/HRKMigrator_dev-3.phar/src/CortexPE/HRKMigrator/Main(165): pocketmine\utils\Utils::errorExceptionHandler(integer 2, string[39] Invalid argument supplied for foreach(), string[120] phar:///home/minecraft/multicraft/servers/PE/pocketmine/plugins/HRKMigrator_dev-, integer 165, array[18])
[06:44:44] [Server thread/DEBUG]: #1 plugins/HRKMigrator_dev-3.phar/src/CortexPE/HRKMigrator/Main(81): CortexPE\HRKMigrator\Main->doMigration()
[06:44:44] [Server thread/DEBUG]: #2 src/pocketmine/scheduler/ClosureTask(61): CortexPE\HRKMigrator\Main->CortexPE\HRKMigrator{closure}(integer 1)
[06:44:44] [Server thread/DEBUG]: #3 src/pocketmine/scheduler/TaskHandler(134): pocketmine\scheduler\ClosureTask->onRun(integer 1)
[06:44:44] [Server thread/DEBUG]: #4 src/pocketmine/scheduler/TaskScheduler(176): pocketmine\scheduler\TaskHandler->run(integer 1)
[06:44:44] [Server thread/DEBUG]: #5 src/pocketmine/plugin/PluginManager(643): pocketmine\scheduler\TaskScheduler->mainThreadHeartbeat(integer 1)
[06:44:44] [Server thread/DEBUG]: #6 src/pocketmine/Server(2380): pocketmine\plugin\PluginManager->tickSchedulers(integer 1)
[06:44:44] [Server thread/DEBUG]: #7 src/pocketmine/Server(2143): pocketmine\Server->tick()
[06:44:44] [Server thread/DEBUG]: #8 src/pocketmine/Server(1990): pocketmine\Server->tickProcessor()
[06:44:44] [Server thread/DEBUG]: #9 src/pocketmine/Server(1584): pocketmine\Server->start()
[06:44:44] [Server thread/DEBUG]: #10 src/pocketmine/PocketMine(273): pocketmine\Server->__construct(object BaseClassLoader, object pocketmine\utils\MainLogger, string[49] /home/minecraft/multicraft/servers/PE/pocketmine/, string[57] /home/minecraft/multicraft/servers/PE/pocketmine/plugins/)
[06:44:44] [Server thread/DEBUG]: #11 src/pocketmine/PocketMine(296): pocketmine\server()
[06:44:44] [Server thread/DEBUG]: #12 (11): require(string[104] phar:///home/minecraft/multicraft/servers/PE/pocketmine/PocketMine-MP.phar/src/p)

@intagaming

[CortexPE]

This fixes a lot of issues that I haven't encountered myself before, thank you for your contribution.