Mathlib v3 is deprecated. Go to Mathlib v4

Commit 2022-08-12 21:16 43e859a0

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feat(probability/martingale/convergence): a.e. martingale convergence theorem (#15904) This PR proves the a.e. martingale convergence while a later PR will show the L¹ version. I've also added a new martingale folder in the probability folder as there are a few files regarding martingales now.

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