[After 4.1] Add golang solution for the dining philosophers problem from section 4.3#21

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paulofelipefeitosa wants to merge 3 commits intothiagomanel:masterfrom paulofelipefeitosa:dining-philosophers-4.3

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Commits on May 5, 2021

Add the solution for the Producer-consumer problem from section 4.1
paulofelipefeitosa
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Commits on May 17, 2021

Add golang solution for the dining philosophers problem from section 4.3
paulofelipefeitosa
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Use mutex instead of channel for forks
paulofelipefeitosa
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