Add LF on the last line (config.yaml)

On MT 5.2.7, I get the following error without the LF:

>  Got an error: Error reading /home/setenv-host1/www/asaito/_sys/mt/plugins/ImageRotator/config.yaml: Failed to load YAML document from string
Merge pull request #1 from rinopo/patch-1

Add LF on the last line (config.yaml)