Update appveyor.yml

Author: BenLauwens

appveyor.yml

@@ -20,7 +20,7 @@ install:
 build_script:
 # Need to convert from shallow to complete for Pkg.clone to work
   - IF EXIST .git\shallow (git fetch --unshallow)
-  - C:\projects\julia\bin\julia -e "versioninfo(); Pkg.init(); Pkg.clone(pwd(), \"SimJulia\"); Pkg.add(\"Distributions\")"
+  - C:\projects\julia\bin\julia -e "versioninfo(); Pkg.init(); Pkg.clone(pwd(), \"SimJulia\")"
 
 test_script:
   - C:\projects\julia\bin\julia test\runtests.jl