Ascii being returned from API

[Josiassejod1]

Bugsnag: URI must be ascii only "https://api.unsplash.com/photos/a-castle-with-many-spires-with-pele\u0219-castle-in-the-background-Grnf3_TTUjo"
    gems/uri-1.1.1/lib/uri/rfc3986_parser.rb:84 in `URI::RFC3986_Parser#split`
    gems/uri-1.1.1/lib/uri/rfc3986_parser.rb:135 in `URI::RFC3986_Parser#parse`
    gems/uri-1.1.1/lib/uri/common.rb:247 in `URI.parse`
    gems/unsplash-3.1.1/lib/unsplash/client.rb:45 in `Unsplash::Client#add_utm_params`
    gems/unsplash-3.1.1/lib/unsplash/client.rb:58 in `block in Unsplash::Client#add_utm_to_links`
    gems/unsplash-3.1.1/lib/unsplash/client.rb:57 in `Hash#each`
    gems/unsplash-3.1.1/lib/unsplash/client.rb:57 in `Unsplash::Client#add_utm_to_links`
    gems/unsplash-3.1.1/lib/unsplash/client.rb:10 in `Unsplash::Client#initialize`
    gems/unsplash-3.1.1/lib/unsplash/photo.rb:7 in `Unsplash::Photo#initialize`
    gems/unsplash-3.1.1/lib/unsplash/search.rb:12 in `Class#new`
    ...and 116 more stack frames
  Analytics Event

  # @private
    def add_utm_params(url)
      uri = URI.parse(url) ❌

      qs = Rack::Utils.parse_nested_query(uri.query)
      qs.merge!(connection.utm_params)

      uri.query = Rack::Utils.build_query(qs)

      uri.to_s
    end

If a photo url has ascii in the name, this will fail in the gem. I fixed this change in #90.