add multiple threads in travis

Author: maximerischard

.travis.yml

@@ -5,27 +5,30 @@ os:
   - osx
 julia:
   - 1.0
-  - 1.1
-  - 1.2
-  - 1.3
   - 1.4
   - nightly
 notifications:
   email: false
 git:
   depth: 99999999
+codecov: true
+coveralls: true
+env:
+    - JULIA_NUM_THREADS=1
+    - JULIA_NUM_THREADS=3
 
 # 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
 
+
 # uncomment following lines to deploy documentation
 jobs:
   include:
     - stage: "Documentation"
-      julia: 1.3
+      julia: 1.4
       os: linux
       script:
         - julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'