ruby: 0001-logic: fix syntax error due to "not" usage
ruby: 0001-logic: fix syntax error due to "not" usage

The existing "not" example yeilded compilation error due to incorrect
bracquet. This patch is created to apply bracquet to "not" statement
and fix the compilation issue.

Signed-off-by: (Holloway) Chew, Kean Ho <bbd8faa40b0f348214bf4124b281a301299ba6dd@gmail.com>

josiahsoh/learning,hollowaykeanho/learning,josiahsoh/learning,hollowaykeanho/learning,hollowaykeanho/learning,hollowaykeanho/learning,josiahsoh/learning,hollowaykeanho/learning,josiahsoh/learning,josiahsoh/learning