Allow spaces instead of underscores for new migration command.

src/Console/CommandArgs.php

@@ -9,7 +9,11 @@ class CommandArgs {
     }
 
     public function getArgs(): array {
-        return $this->args;
+        return array_slice($this->args, 2);
+    }
+
+    public function getArgCount(): int {
+        return count($this->args) - 2;
     }
 
     public function getCommand(): string {

src/Console/Commands/NewMigrationCommand.php

@@ -33,7 +33,7 @@ MIG;
     }
 
     public function dispatch(CommandArgs $args): void {
-        $name = trim($args->getArg(0));
+        $name = str_replace(' ', '_', implode(' ', $args->getArgs()));
 
         if(empty($name)) {
             echo 'Specify a migration name.' . PHP_EOL;