Update EIP-1186: fix typo

[andrewcoder666]

"a object" to "an object"

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[eth-bot]

File EIPS/eip-1186.md

Requires 1 more reviewers from @axic, @g11tech, @lightclient, @samwilsn

[github-actions[bot]]

The commit 9d23e002ce85d2d71643ff7422fd8761a709d448 (as a parent of 82847c28aa71e74967d92c0e9419b2539e7ef867) contains errors. Please inspect the Run Summary for details.