updates to ubuntu:bionic in travis

[morlay]

Which problem is this PR solving?

• system version updates for installing new version docker

Short description of the changes

[codecov]

Codecov Report

Merging #2334 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2334   +/-   ##
=======================================
  Coverage   95.65%   95.65%           
=======================================
  Files         205      205           
  Lines       10529    10529           
=======================================
  Hits        10071    10071           
- Misses        391      392    +1     
+ Partials       67       66    -1     

Impacted Files	Coverage Δ
...lugin/sampling/strategystore/adaptive/processor.go	99.20% <0.00%> (-0.80%)	⬇️
cmd/query/app/server.go	93.18% <0.00%> (+2.27%)	⬆️

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