Fix conditional in Object#instance_variable_defined?
Fix conditional in Object#instance_variable_defined?

Closes #64.

Signed-off-by: Misty De Meo <85d6b3741948526aebc363d97f74b6575b2cc027@gmail.com>

ahihi/tigerbrew,ahihi/tigerbrew,ahihi/tigerbrew,ahihi/tigerbrew