TransportQueryError should extend TransportError

[leszekhanusz]

See #391

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (3e4febb) compared to base (2827d88).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##            master      #392   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           27        27           
  Lines         2367      2367           
=========================================
  Hits          2367      2367           

Impacted Files	Coverage Δ
gql/transport/exceptions.py	100.00% <100.00%> (ø)

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