Update .travis.yml

Author: theogf

.travis.yml

@@ -8,10 +8,7 @@ julia:
   - 1.3
   - 1.4
   - nightly
-# because of Zygote needs to allow failing on nightly
-matrix:
-  allow_failures:
-    - julia: nightly
+ 
 notifications:
   email: false
 after_success:
@@ -27,3 +24,5 @@ jobs:
         - julia --project=docs/ -e 'using Pkg; Pkg.develop(PackageSpec(path=pwd())); Pkg.instantiate()'
         - julia --project=docs/ docs/make.jl
       after_succes: skip
+  allow_failures:
+    - julia: nightly