 Packages SHOULD be referred to by the whole package version number and 
      not use wildcards, except for the patch version in a SemVer version reference.
      The x in the following example means that a package resolver should accept the package
      with the highest found patch number:
<pre class="json">
"dependencies": {
  "hl7.fhir.r5.core": "5.0.x"
}
</pre>
    A dependency on a core package is required, and this dependency defines the FHIR version used to resolve the contents of this dep