Filtering JSONB Array Throws Error

[acwright]

Attempting to filter a jsonb array:

filter_on :tags, type: :jsonb

Throws an error:

undefined local variable or method `val' for #<Sift::WhereHandler:0xb0fe4148 @param=#<Sift::Parameter:0xb131ed98 @param=:tags, @type=:jsonb, @internal_name=:tags>>

It looks like this is a simple typo in Sift::WhereHandler. I will submit a pull request with a fix.

[acwright]

Submitted pull request #56