remove AV, only test on nightly, test without Pkg server as well

Author: KristofferC

.travis.yml

@@ -2,12 +2,17 @@ language: julia
 
 julia:
   # - 1.0
-  - 1.4
+  # - 1.4
   - nightly
 
 os:
   - linux
   - osx
+  - windows
+
+env:
+- JULIA_PKG_SERVER="https://pkg.julialang.org"
+- JULIA_PKG_SERVER=""
 
 notifications:
   email: false