fix coverage

Author: Joe Petviashvili

.travis.yml

@@ -25,6 +25,6 @@ before_script:
   # - julia -e 'using Pkg; Pkg.add("AutoDiffSource");'
 after_success:
   # push coverage results to Coveralls
-  - julia -e 'cd(Pkg.dir("ArrayFire")); using Pkg; Pkg.add("Coverage"); using Coverage; Coveralls.submit(Coveralls.process_folder())'
+  - julia -e 'using Pkg; Pkg.add("Coverage"); using Coverage; Coveralls.submit(Coveralls.process_folder())';
   # push coverage results to Codecov
-  - julia -e 'cd(Pkg.dir("ArrayFire")); using Pkg; Pkg.add("Coverage"); using Coverage; Codecov.submit(Codecov.process_folder())'
+  - julia -e 'using Pkg; Pkg.add("Coverage"); using Coverage; Codecov.submit(Codecov.process_folder())'