to_json_schema: Change IntegerField to type:integer and FloatField to type:number

While in [json-schema](https://json-schema.org/understanding-json-schema/reference/numeric.html#number)
it is described that: 
"In Python, "number" is analogous to the float type"
and 
"In Python, "integer" is analogous to the int type."

In jsmodels the  IntegerField becomes type:muber and FloatField to type:float.
Shouldn't this be changed to support the json-schema Specification ? 
