Fix method definition warning

[ChrisRackauckas]

Fixes #152

[KristofferC]

I don't see how this solves anything 😕 . You still have two methods that only differ in their keyword arguments.

With master of package:

┌ Integrals [de52edbc-65ea-441a-8357-d3a637375a31]
│  WARNING: Method definition solve(SciMLBase.IntegralProblem{isinplace, P, F, L, U, K} where K where U where L where F where P where isinplace) in module Integrals at /home/kc/JuliaPkgs/Integrals.jl/src/Integrals.jl:60 overwritten at /home/kc/JuliaPkgs/Integrals.jl/src/Integrals.jl:111.
│    ** incremental compilation may be fatally broken for this module **
│  
│  WARNING: Method definition kwcall(Any, typeof(CommonSolve.solve), SciMLBase.IntegralProblem{isinplace, P, F, L, U, K} where K where U where L where F where P where isinplace) in module Integrals at /home/kc/JuliaPkgs/Integrals.jl/src/Integrals.jl:60 overwritten at /home/kc/JuliaPkgs/Integrals.jl/src/Integrals.jl:111.
│    ** incremental compilation may be fatally broken for this module **