support implicit .NET conversions on option types

[ieviev]

currently the LINQ expression visitor runs into an exception when dealing with implicit numeric conversions.

since both of the following examples are valid F# i added support for these implicit conversions

// runs just fine
let query1 = 
    selectAsync HydraReader.Read (Create openContext) {
        for c in Sqlite.QueryUnitTests.errorLogTable do
        where (c.ErrorSeverity = Some 1L)
    }

// runs into an exception    
let query2 = 
    selectAsync HydraReader.Read (Create openContext) {
        for c in Sqlite.QueryUnitTests.errorLogTable do
        where (c.ErrorSeverity = Some 1)
    }

[JordanMarr]

I have definitely run into this problem before with implicit conversions. Thanks for fixing it!!

[JordanMarr]

Merged and release as SqlHydra.Query v1.0.5. Thank you! (I also added support for non-option types and implicit calls that are not upcasts, like int to decimal!)

[ieviev]

@JordanMarr Great! Thank you for updating it so quickly