added /eight_ball command

data/8-ball_classic.txt

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+Yes.
+No.
+Maybe.
+Ask again later.
+Cannot predict now.
+Outlook not so good.
+Signs point to yes.
+Very doubtful.
+Without a doubt.
+Better not tell you now.

data/8-ball_quirky.txt

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+42 (That’s the answer, right?)
+Try turning it off and on again.
+Error 404: Answer not found.
+Consult your nearest wizard.
+Ask your cat. They know everything.
+The stars say yes, but the moon disagrees.
+You don’t want to know… trust me.
+Sure, but don’t quote me on that.
+In an alternate universe, yes.
+Why are you asking a stupid bot?
+Only if you bring snacks.
+Flip a coin; I’m on break.
+The spirits are buffering... please wait.
+You already know the answer.