Update Sync Rewards

[dmtrjsg]

Per video:

• Bronze - no rewards
• Silver - 3$
• Gold - 5$
• Diamond - 8$

[zeeshanakram3]

Done in https://github.com/zeeshanakram3/youtube-synch/commit/bfec4f2d01707bd3be451246c095496b9e62f9ef