Fix %%gremlin profile
serializer issue on Neptune DB <=1.2.x
#694
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Issue #, if available: #693
Description of changes:
%%gremlin profile --profile-serializer
option fromGRAPHSON_V3_UNTYPED
toGRAPHSON_V3
(typed). This fixed a backwards compatibility issue with Neptune Database instances on major engine version 1.2 or older.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.