Fix outdated dependencies and NPM audit warnings (#334)

- deps update
- package lock update
- minor code changes to align with updated libraries

/cc @daxeh

Fixes #333

test/user.test.ts

@@ -18,26 +18,27 @@ describe("GET /forgot", () => {
 });
 
 describe("GET /signup", () => {
-    it("should return 200 OK", () => {
-        return request(app).get("/signup")
-            .expect(200);
+    it("should return 200 OK", (done) => {
+        request(app).get("/signup")
+            .expect(200)
+            .end(() => done());
     });
 });
 
 describe("GET /reset", () => {
-    it("should return 302 Found for redirection", () => {
-        return request(app).get("/reset/1")
-            .expect(302);
+    it("should return 302 Found for redirection", (done) => {
+        request(app).get("/reset/1")
+            .expect(302).end(() => done());
     });
 });
 
 describe("POST /login", () => {
     it("should return some defined error message with valid parameters", (done) => {
-        return request(app).post("/login")
+        request(app).post("/login")
             .field("email", "john@me.com")
             .field("password", "Hunter2")
             .expect(302)
-            .end(function(err, res) {
+            .end((err, res) => {
                 expect(res.error).not.to.be.undefined;
                 done();
             });