gql-cli add --transport argument

[leszekhanusz]

No description provided.

[codecov-commenter]

Codecov Report

Merging #281 (6ad7af7) into master (e2d2085) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##            master      #281   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           26        26           
  Lines         1997      2041   +44     
=========================================
+ Hits          1997      2041   +44     

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

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