update travis

Author: CarloLucibello

.travis.yml

@@ -7,6 +7,7 @@ os:
 
 julia:
   - 1.3
+  - 1
   - nightly
 
 notifications:
@@ -15,7 +16,7 @@ notifications:
 jobs:
   include:
     - stage: "Documentation"
-      julia: 1.3
+      julia: 1
       os: linux
       script:
         - julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd()));