Update rebuses.js

[avinashji1302]

Please check ...If there is any mistake ..Please let me know

Associated Issue: #

Summary of Changes

• change 1 (Added these) { symbols:['❤','+','💌'], words:['Love-letter'], hint:'We used to sent .... to our girlfriends' },

{ symbols:['⌚','+','🐶'], words:['Watch-dog'], hint:'A loyal animal' }

[avinashji1302]

Check this and please let me know if there is any misktake