The unpac monorepo manager self-hosting as a monorepo using unpac

Prepare v3.4.0

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CHANGES.md
··· 1 + ### v3.4.0 (2020-03-13) 2 + 3 + - Fix tests about `alcotest.1.0.0` (@dinosaure, #40) 4 + - Be more strict about padding when we decode a base64 input (@dinosaure, @hannesm, @cfcs, #43) 5 + - Remove `fmt` dependency (#43) 6 + 1 7 ### v3.3.0 (2019-01-30) 2 8 3 9 - Remove `build` directive on dune dependency (@CraigFe, #35)