check_positive_definite semi kwarg not working

[semussan]

In LinearOperators.jl, line 496, I had to change the line to
check_positive_definite(M :: AbstractMatrix; semi=false) = check_positive_definite(LinearOperator(M); semi=false)

in order to use the semi keyword argument

Maybe something to check

[dpo]

Sure, that's an omission. Thanks! It should be

check_positive_definite(M :: AbstractMatrix; kwargs...) = check_positive_definite(LinearOperator(M); kwargs...)

Would you like to submit a pull request? It would be great to add a small test to check that this works.