Add GoJoy Chain to README

[acravenho]

Motivation

GoJoy Chain is using BlockScout and thought it should be added to the README

Changelog

• updated README

Checklist for your PR

• I added an entry to CHANGELOG.md with this PR
• If I added new functionality, I added tests covering it.
• If I fixed a bug, I added a regression test to prevent the bug from silently reappearing again.
• I checked whether I should update the docs and did so if necessary

[coveralls]

Pull Request Test Coverage Report for Build eb8b0ebd-e928-4825-b8bb-038c4b59ab6c

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.3%) to 80.728%

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Files with Coverage Reduction	New Missed Lines	%
apps/explorer/lib/explorer/market/market_history_cache.ex	2	88.89%

Totals
Change from base Build d28b73fc-2367-4891-85c9-038031a4a315:	-0.3%
Covered Lines:	5144
Relevant Lines:	6372

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💛 - Coveralls