Fixed weird fhirpath versioning quirks

Author: Dtphelan1

package-lock.json

@@ -20,12 +20,12 @@
   "license": "Apache-2.0",
   "dependencies": {
     "ajv": "^6.12.6",
-    "antlr4": "^4.8.0",
+    "antlr4": "4.8.0",
     "axios": "^0.19.0",
     "commander": "^6.2.0",
     "csv-parse": "^4.8.8",
     "fhir-crud-client": "^1.2.1",
-    "fhirpath": "^2.1.5",
+    "fhirpath": "2.1.5",
     "lodash": "^4.17.19",
     "moment": "^2.26.0",
     "nodemailer": "^6.4.14",