Fix #586: require newer excon, use valid parameter keys interface #588
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Problem
As noted in #586, newer versions of Excon will freeze the valid request keys array. At require time, this will raise an error.
Solution
In version v0.63/v0.64, there was introduced a method on the base middleware that we can extend to satisfy the requirement necessary for the hijack middleware.
We can bump the minimum required
excon
version, and make use of that method, no longer modifying the constant.