Add Clang 4.0 to .travis.yml and allow 6.0 to fail#265

Merged

poulson merged 1 commit intoelemental:masterfrom JM1:master

Aug 13, 2018

+10

Commits on Aug 9, 2018

Add Clang 4.0 to .travis.yml and allow 6.0 to fail
JM1
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