Revert "Fix appveyor"

This reverts commit 6a5ee6b.

appveyor.yml

@@ -40,7 +40,7 @@ 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(); using Pkg; Pkg.activate("."); Pkg.instantiate(); Pkg.build(\"BKMaxflow\")"
+  - C:\projects\julia\bin\julia -e "versioninfo(); using Pkg; Pkg.instantiate(); Pkg.build(\"BKMaxflow\")"
 
 test_script:
   - C:\projects\julia\bin\julia -e "Pkg.test(\"BKMaxflow\")"