Update .travis.yml.

.travis.yml

@@ -4,11 +4,13 @@ os:
   - linux
   - osx
 julia:
-  - 0.5
   - 0.6
   - nightly
 notifications:
   email: false
+matrix:
+  allow_failures:
+  - julia: nightly
 # uncomment the following lines to override the default test script
 # script:
 #  - if [[ -a .git/shallow ]]; then git fetch --unshallow; fi
@@ -17,6 +19,6 @@ after_success:
   # push coverage results to Coveralls
   - julia -e 'cd(Pkg.dir("Unitful")); Pkg.add("Coverage"); using Coverage; Coveralls.submit(Coveralls.process_folder())'
   # push coverage results to Codecov
-  - julia -e 'cd(Pkg.dir("Unitful")); Pkg.add("Coverage"); using Coverage; Codecov.submit(process_folder())'
+  - julia -e 'cd(Pkg.dir("Unitful")); using Coverage; Codecov.submit(process_folder())'
   - julia -e 'Pkg.add("Documenter")'
   - julia -e 'cd(Pkg.dir("Unitful")); include(joinpath("docs", "make.jl"))'