[balance-of-with-max] Updated balance-of-with-max to add weight

[thomasscovell]

Updated balance-of-with-max strategy to add an optional weight

Changes proposed in this pull request:

• added weight as an option to multiply token total by
• example weight set to 1

[thomasscovell]

@ChaituVR as suggested I have updated this strategy to include weight rather than adding a new strategy. Thanks.