HL7Converter Fails To Run On Windows

[dixonwhitmire]

Related to #38 - The following code blocks

    public void startConverter() throws IOException {
        HL7ToFHIRConverter converter = new HL7ToFHIRConverter();
        String fhirMessage = converter.convert(hl7Message);
        System.out.println(fhirMessage);
    }


    public static void main(String[] args) throws Exception {
        App app = new App();
        app.startConverter();
    }

fail to run due to the following stack trace

Exception in thread "main" java.lang.NullPointerException
	at java.io.Reader.<init>(Reader.java:78)
	at java.io.InputStreamReader.<init>(InputStreamReader.java:113)
	at org.apache.commons.io.IOUtils.copy(IOUtils.java:2440)
	at org.apache.commons.io.IOUtils.toString(IOUtils.java:1084)
	at io.github.linuxforhealth.hl7.resource.ResourceReader.loadClassPathResource(ResourceReader.java:66)
	at io.github.linuxforhealth.hl7.resource.ResourceReader.getResource(ResourceReader.java:84)
	at io.github.linuxforhealth.hl7.resource.ResourceReader.getResourceInHl7Folder(ResourceReader.java:164)
	at io.github.linuxforhealth.hl7.resource.ResourceReader.getMessageModel(ResourceReader.java:111)
	at io.github.linuxforhealth.hl7.resource.ResourceReader.getMessageTemplates(ResourceReader.java:99)
	at io.github.linuxforhealth.hl7.HL7ToFHIRConverter.<init>(HL7ToFHIRConverter.java:49)
	at io.github.linuxforhealth.converter.App.startConverter(App.java:19)
	at io.github.linuxforhealth.converter.App.main(App.java:26)