add coverage reports

Author: abhinavmehndiratta

.travis.yml

@@ -8,5 +8,6 @@ julia:
   - 1.0
 
 after_success:
+    - julia -e 'using Pkg; cd(Pkg.dir("SuiteSparseGraphBLAS")); Pkg.add("Coverage"); using Coverage; Codecov.submit(process_folder())'
     - julia -e 'using Pkg; ps=Pkg.PackageSpec(name="Documenter", version="0.22"); Pkg.add(ps); Pkg.pin(ps)'
     - julia -e 'using Pkg; cd(Pkg.dir("SuiteSparseGraphBLAS")); include(joinpath("docs", "make.jl"))'