Adding 1.5 to the test builds

Using 1.5 over Julia 1.4.

Author: sambitdash

.travis.yml

@@ -2,7 +2,7 @@ language: julia
 
 julia:
   - 1.0
-  - 1.4
+  - 1.5
   - nightly
 
 os:
@@ -22,7 +22,7 @@ after_success:
 jobs:
   include:
     - stage: "Documentation"
-      julia: 1.4
+      julia: 1.5
       os: linux
       script:
         - julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'

appveyor.yml

@@ -1,7 +1,7 @@
 environment:
   matrix:
   - julia_version: 1.0
-  - julia_version: 1.4
+  - julia_version: 1.5
   - julia_version: nightly
 
 platform: