Hello

Following fix for #1865 the name of the schema lost the dots

The name of the schema being of importance in the code generation, I think the swagger-parser should keep the dots as per the referenced file name

This mean that at
https://github.com/swagger-api/swagger-parser/blob/master/modules/swagger-parser-v3/src/test/java/io/swagger/v3/parser/test/OpenAPIV3ParserTest.java#L115
I expect to see #/components/schemas/foo.model
instead of #/components/schemas/foomodel