Add faraday monkey patch to fix headers.dup shallow dup.
Add faraday monkey patch to fix headers.dup shallow dup.

From: https://github.com/lostisland/faraday/pull/478

Without this change, a connection's header and each request's header
all reference the same `@names` hash object so any request that modified
it via delete or other mutating methods, would affect the headers of other
requests and the connection.

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