fix undefined URL issues (#2818)

* import URL where necessary

* changelog

* formatting hard

Author: bkendall

CHANGELOG.md

@@ -0,0 +1 @@
+- Fixes issue when running in a Node 8 environment where `URL` was not defined. (#2817)

src/commands/database-settings-get.ts

@@ -1,3 +1,5 @@
+import { URL } from "url";
+
 import { Client } from "../apiv2";
 import { Command } from "../command";
 import { DATABASE_SETTINGS, HELP_TEXT, INVALID_PATH_ERROR } from "../database/settings";

src/commands/database-settings-set.ts

@@ -1,3 +1,5 @@
+import { URL } from "url";
+
 import { Client } from "../apiv2";
 import { Command } from "../command";
 import { DATABASE_SETTINGS, HELP_TEXT, INVALID_PATH_ERROR } from "../database/settings";

src/commands/database-update.ts

@@ -1,3 +1,4 @@
+import { URL } from "url";
 import * as clc from "cli-color";
 import * as fs from "fs";
 

src/emulator/download.ts

@@ -1,3 +1,4 @@
+import { URL } from "url";
 import * as crypto from "crypto";
 import * as fs from "fs-extra";
 import * as path from "path";