try adding --inline=no to see if it improves code coverage accuracy

See also:
 - JuliaCI/Coverage.jl#187
 - JuliaLang/julia#28192
 - JuliaLang/Pkg.jl#865

Author: wdebeaum

Diff for: .travis.yml

@@ -12,4 +12,4 @@ notifications:
   email: false
 after_success:
   # push coverage results to Codecov
-  - julia -e 'cd(Pkg.dir("Choices")); Pkg.add("Coverage"); using Coverage; Codecov.submit(Codecov.process_folder())'
+  - julia --inline=no -e 'cd(Pkg.dir("Choices")); Pkg.add("Coverage"); using Coverage; Codecov.submit(Codecov.process_folder())'