[ci] revert to xenial

It should've done in a branch
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Ebrahim Byagowi 2019-06-02 13:51:26 +04:30 committed by GitHub
parent 8278ff7dce
commit 7c14b90145
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@ -1,5 +1,5 @@
# Build Configuration for Travis
dist: trusty
dist: xenial
language: cpp