Type matchup test is flaky

[adapap]

One round of battle
C:/Code/Pokemon Battle Lib/battle_test.go:119
  when dealing damage to a Pokemon
  C:/Code/Pokemon Battle Lib/battle_test.go:173
    Type Matchups
    C:/Code/Pokemon Battle Lib/battle_test.go:189
      should account for supereffective type matchups [It]
      C:/Code/Pokemon Battle Lib/battle_test.go:206

      Expected
          <int>: -2
      to be >
          <int>: 3

      C:/Code/Pokemon Battle Lib/battle_test.go:216