Update travis

Add Julia 1.5 support.

Author: PyDataBlog

.travis.yml

@@ -6,6 +6,7 @@ os:
 julia:
   - 1.3
   - 1.4
+  - 1.5
   - nightly
 after_success:
   - julia -e 'using Pkg; Pkg.add("Coverage"); using Coverage; Coveralls.submit(process_folder())'
@@ -15,7 +16,7 @@ jobs:
   fast_finish: true
   include:
     - stage: Documentation
-      julia: 1.4
+      julia: 1.5
       script: julia --project=docs -e '
           using Pkg;
           Pkg.develop(PackageSpec(path=pwd()));