Updating AxiosError to include stack trace (#4624)

Related to discussions here #2387

Attempt to capture the stack trace at the time the error is created in
order to maintain context about where the error originates from.

Co-authored-by: Jay <jasonsaayman@gmail.com>

lib/core/AxiosError.js

@@ -14,6 +14,11 @@ var utils = require('../utils');
  */
 function AxiosError(message, code, config, request, response) {
   Error.call(this);
+
+  if (Error.captureStackTrace) {
+    Error.captureStackTrace(this);
+  }
+
   this.message = message;
   this.name = 'AxiosError';
   code && (this.code = code);

test/specs/core/AxiosError.spec.js

@@ -1,7 +1,7 @@
 var AxiosError = require('../../../lib/core/AxiosError');
 
 describe('core::AxiosError', function() {
-  it('should create an Error with message, config, code, request, response and isAxiosError', function() {
+  it('should create an Error with message, config, code, request, response, stack and isAxiosError', function() {
     var request = { path: '/foo' };
     var response = { status: 200, data: { foo: 'bar' } };
     var error = new AxiosError('Boom!', 'ESOMETHING', { foo: 'bar' }, request, response);
@@ -12,6 +12,7 @@ describe('core::AxiosError', function() {
     expect(error.request).toBe(request);
     expect(error.response).toBe(response);
     expect(error.isAxiosError).toBe(true);
+    expect(error.stack).toBeDefined();
   });
   it('should create an Error that can be serialized to JSON', function() {
     // Attempting to serialize request and response results in