Rely on JSON3 nothing->null serialization instead of CleanDict

Author: pankgeorg

src/http_execution.jl

@@ -66,20 +66,16 @@ julia> GraphQLClient.execute(client, query_string, operation_name="getCountries"
 ```
 """
 
-function CleanDict(pairs::Pair...)
-    return Dict(p for p in pairs if !isnothing(p[2]))
-end
-
 execute(query::AbstractString, output_type::Type{T}=Any; kwargs...) where T = execute(global_graphql_client(), query, output_type; kwargs...)
 function execute(client::Client, query::AbstractString, output_type::Type{T}=Any; variables=Dict(), operation_name=nothing, kwargs...) where T
-    return execute(client, CleanDict("query" => query, "variables" => variables, "operationName" => operation_name), output_type; kwargs...)
+    return execute(client, Dict("query" => query, "variables" => variables, "operationName" => operation_name), output_type; kwargs...)
 end
 execute(payload::AbstractDict, output_type::Type{T}=Any; kwargs...) where T  = execute(global_graphql_client(), payload, output_type; kwargs...)
 function execute(client::Client, payload::AbstractDict, output_type::Type{T}=Any; kwargs...) where T
     return execute(client.endpoint, payload, client.headers, output_type; kwargs...)
 end
 function execute(endpoint::AbstractString, query::AbstractString, headers::AbstractDict=Dict(), output_type::Type{T}=Any; variables=Dict(), operation_name=nothing, kwargs...) where T
-    return execute(endpoint, CleanDict("query" => query, "variables" => variables, "operationName" => operation_name), headers, output_type; kwargs...)
+    return execute(endpoint, Dict("query" => query, "variables" => variables, "operationName" => operation_name), headers, output_type; kwargs...)
 end
 function execute(endpoint::AbstractString, payload::AbstractDict, headers::AbstractDict=Dict(), output_type::Type{T}=Any; kwargs...) where T
     return _execute(endpoint, JSON3.write(payload), headers, output_type; kwargs...)