add travis

.travis.yml

@@ -0,0 +1,31 @@
+language: julia
+
+os:
+  - osx
+  - linux
+
+julia:
+  - 1.0
+  - 1.1
+  - 1.2
+  - nightly
+
+# # Uncomment the following lines to allow failures on nightly julia
+# # (tests will run but not make your overall status red)
+# matrix:
+#   allow_failures:
+#   - julia: nightly
+
+notifications:
+  email: false
+
+#jobs:
+#  include:
+#    - stage: "Documentation"
+#      julia: 1.0
+#      os: linux
+#      script:
+#        - julia --project=docs/ -e 'using Pkg; Pkg.instantiate();
+#                                    Pkg.develop(PackageSpec(path=pwd()))'
+#        - julia --project=docs/ docs/make.jl
+#      after_success: skip