[3.0.0] fix java.lang.NoSuchMethodError

[jmini]

I got this error when I have opened this spec: api.yaml

Exception in thread "main" java.lang.NoSuchMethodError: io.swagger.models.Response.responseSchema(Lio/swagger/models/Model;)Lio/swagger/models/Response;
	at io.swagger.parser.util.SwaggerDeserializer.response(SwaggerDeserializer.java:1113)
	at io.swagger.parser.util.SwaggerDeserializer.responses(SwaggerDeserializer.java:1067)
	at io.swagger.parser.util.SwaggerDeserializer.operation(SwaggerDeserializer.java:341)
	at io.swagger.parser.util.SwaggerDeserializer.path(SwaggerDeserializer.java:223)
	at io.swagger.parser.util.SwaggerDeserializer.paths(SwaggerDeserializer.java:188)
	at io.swagger.parser.util.SwaggerDeserializer.parseRoot(SwaggerDeserializer.java:109)
	at io.swagger.parser.util.SwaggerDeserializer.deserialize(SwaggerDeserializer.java:39)
	at io.swagger.parser.Swagger20Parser.readWithInfo(Swagger20Parser.java:34)
	at io.swagger.parser.Swagger20Parser.readWithInfo(Swagger20Parser.java:66)
	at io.swagger.parser.SwaggerParser.readWithInfo(SwaggerParser.java:31)
	at io.swagger.v3.parser.converter.SwaggerConverter.readLocation(SwaggerConverter.java:88)
	at io.swagger.v3.parser.OpenAPIV3Parser.read(OpenAPIV3Parser.java:86)

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I think the problem is that io.swagger:swagger-codegen:3.0.0-SNAPSHOT is defining following dependenies:

• io.swagger:swagger-core:1.5.17
• io.swagger:swagger-models:1.5.17

This a problem, because it overrides the versions defined in io.swagger:swagger-parser:1.0.35-SNAPSHOT and in io.swagger:swagger-compat-spec-parser:1.0.35-SNAPSHOT.

I propose to remove the dependency declaration in io.swagger:swagger-codegen:3.0.0-SNAPSHOT, because it makes no sense to force to use a specific version of the dependencies.