Fix reactor Stream imports

Compilation fails with current imported Streams package

    [INFO] -------------------------------------------------------------
    [ERROR] src/main/java/demo/ProcessorApplication.java:[26,23] package reactor.rx.spec does not exist
    [ERROR] src/main/java/demo/domain/LocationService.java:[13,23] package reactor.rx.spec does not exist
    [ERROR] src/main/java/demo/ProcessorApplication.java:[44,24] cannot find symbol
      symbol:   variable Streams
      location: class demo.ProcessorApplication