Use Go 1.11 in Travis

[isaachier]

No description provided.

[jpkrohling]

Two of the CI jobs failed, probably related to Travis connectivity, so, I restarted them. One failed again, in a different step and might be relevant to this PR:

Go fmt, license check, or import ordering failures, run 'make fmt'
./crossdock/services/tracehandler_test.go
./plugin/storage/cassandra/dependencystore/storage.go
./plugin/storage/cassandra/spanstore/writer_test.go
make: *** [lint] Error 1

[isaachier]

Oh ya that formatting changes need to be applied. Ill get to that asap.

[isaachier]

The tests need to be rerun.

[codecov]

Codecov Report

Merging #1053 into master will not change coverage.
The diff coverage is 100%.

@@          Coverage Diff           @@
##           master   #1053   +/-   ##
======================================
  Coverage     100%    100%           
======================================
  Files         139     139           
  Lines        6451    6451           
======================================
  Hits         6451    6451

Impacted Files	Coverage Δ
...lugin/storage/cassandra/dependencystore/storage.go	100% <100%> (ø)	⬆️

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[isaachier]

Thanks @black-adder. Go 1.11 has an issue in the race detector when calling len on a channel (golang/go#27070). Sarama fails this test repeatedly. IDK how you got tests to run here.

[black-adder]

Gonna roll back until the fix is in