Correct open source to open-source in README.md
Test Plan: NA
Reviewers: deadalnix, freetrader, jasonbcox, #bitcoin_abc, Mengerian
Reviewed By: #bitcoin_abc, Mengerian
Differential Revision: https://reviews.bitcoinabc.org/D848
Correct `open source` to `open-source` in README.md Tags None Subscribers None
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