Fixed: HcfMiddleware._get_slot fails in Python 3

[starrify]

No description provided.

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@4f06d95). Click here to learn what that means.
The diff coverage is 50%.

@@            Coverage Diff            @@
##             master       #3   +/-   ##
=========================================
  Coverage          ?   24.13%           
=========================================
  Files             ?        2           
  Lines             ?      116           
  Branches          ?        0           
=========================================
  Hits              ?       28           
  Misses            ?       88           
  Partials          ?        0

Impacted Files	Coverage Δ
scrapy_hcf/middleware.py	22.8% <50%> (ø)

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