strip out old dependencies (#3)

* strip out old dependencies

* add fetch polyfill back

* pass fullUrl instead of root

* revert headers as constant, remove brackets for one liner if

lib/index.js

@@ -1,7 +1,5 @@
 const fetchPonyfill = require('fetch-ponyfill');
-const objectAssign = require('es6-object-assign').assign;
 const qs = require('qs');
-const url = require('url');
 const rTracer = require('cls-rtracer');
 
 const { fetch } = fetchPonyfill();
@@ -20,10 +18,10 @@ function jsonClient(baseUrl, options) {
 
 	return function jsonClientRequest(method, path, params, body, options) {
 		const query = params ? '?' + qs.stringify(params) : '';
-		const resolved = new url(path + query, resolvedBaseUrl);
+		const resolved = new URL(path + query, resolvedBaseUrl);
 		const reqOptions = mergeOptions(baseOptions, options);
 
-		return makeRequest(method, resolved, body, reqOptions);
+		return makeRequest(method, resolved.href, body, reqOptions);
 	};
 }
 
@@ -101,13 +99,12 @@ function makeRequest(method, fullUrl, body, options) {
 
 function mergeOptions(baseOptions, newOptions) {
 	const resolvedNewOptions = newOptions || {};
-	const headers = objectAssign({}, baseOptions.headers, resolvedNewOptions.headers);
+	const headers = {...baseOptions.headers, ...resolvedNewOptions.headers};
 
 	const reqID = rTracer.id() ?? null;
-	if (reqID !== null)
-		headers = objectAssign({}, headers, { 'request-id': reqID })
+	if (reqID !== null) 
+		headers['request-id'] = reqID
+
 
-	return objectAssign({}, baseOptions, newOptions, {
-		headers: headers,
-	});
+	return {...baseOptions, ...newOptions, ...{headers: headers}};
 }

package.json

@@ -15,10 +15,8 @@
   },
   "dependencies": {
     "cls-rtracer": "^2.6.0",
-    "es6-object-assign": "^1.1.0",
     "fetch-ponyfill": "^7.1.0",
-    "qs": "^6.5.2",
-    "url": "^0.11.0"
+    "qs": "^6.5.2"
   },
   "keywords": [
     "json",