Handle nothing as missing in binding.

[BenjaminGalliot]

Related to this issue.

I added a method for bind! function, and it solves my problem seen in previous MWE, but do I need to also add something on sqlitetype function (and its related test)?

Currently, with only bind! added, I have this:

julia> SQLite.sqlitetype(Missing)
"NULL"

julia> SQLite.sqlitetype(Nothing)
"BLOB NOT NULL"

Tell me if further modifications are needed.

[codecov]

Codecov Report

Merging #236 (85c8176) into master (f3da928) will decrease coverage by 0.02%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##           master     #236      +/-   ##
==========================================
- Coverage   83.30%   83.27%   -0.03%     
==========================================
  Files           5        5              
  Lines         605      610       +5     
==========================================
+ Hits          504      508       +4     
- Misses        101      102       +1     

Impacted Files	Coverage Δ
src/SQLite.jl	96.21% <50.00%> (-0.40%)	⬇️
src/api.jl	40.98% <0.00%> (+0.48%)	⬆️
src/consts.jl	90.90% <0.00%> (+2.02%)	⬆️

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[quinnj]

Yeah, looks like we need sqlitetype(::Type{Nothing}) = "NULL" in the SQLite.jl file.