adding param options

[creedasaurus]

This PR will add functionality to set query parameters on each fetcher request.

Example:

c := context.Background()
  cl, err := fetcher.NewClient(c,
    fetcher.WithRequestOptions([]fetcher.RequestOption{
      fetcher.WithAcceptJSONHeader(),
      fetcher.WithParams("foo", "bar"),
      fetcher.WithParams("baz", "quz"),
    }),
  )

And each subsequent request would be made with the params, properly escaped:
http://example.url.com/path?foo=bar&baz=qux

Also there will be an update to the circleci/reviewdog config.

[codecov]

Codecov Report

Merging #49 into master will increase coverage by 1.17%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master      #49      +/-   ##
==========================================
+ Coverage   42.28%   43.45%   +1.17%     
==========================================
  Files          10       10              
  Lines         674      688      +14     
==========================================
+ Hits          285      299      +14     
  Misses        349      349              
  Partials       40       40

Impacted Files	Coverage Δ
request.go	22.67% <100%> (+4.64%)	⬆️

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[josephbergevin]

Looks great! Nice work @creedasaurus