v1.1.3 (Critical)

Important fixes for exploits so this can actually be used properly... sigh... why didn't I see this before!?

• Updated Gradle to 4.2.1
• Added /fe toss to test withdraws
• Made it so you can't pay someone a negative amount
• Made it so you you shouldn't be able to withdraw or deposit a negative amount
  • it'll automatically redirect to the other function
• Updated plugin id so it compiles again
• Compile for 1.11.2 / SpongeAPI v5, on JDK 1.8.0_144
• Dropped 1.8.9 support