`ezhttp`: support for not following redirects

[joonas-fi]

var (
        // can't patch existing HTTP client because we could end up modifying `http.DefaultClient`
        // https://stackoverflow.com/a/38150816
	noFollowRedirects = ezhttp.Client(&http.Client{
		CheckRedirect: func(_ *http.Request, _ []*http.Request) error {
			// no error - just don't follow redirects
			return http.ErrUseLastResponse
		},
	})
)