Merge remote-tracking branch 'origin/develop' into sabrecat/mongodb-upgrade

# Conflicts:
#	config.json.example
#	package-lock.json
#	package.json

test/helpers/mongo.js

@@ -75,15 +75,10 @@ export async function getDocument (collectionName, doc) {
 }
 
 before(done => {
-  mongoose.connection.on('open', err => {
-    if (err) return done(err);
-    return resetHabiticaDB()
-      .then(() => {
-        done();
-      })
-      .catch(error => {
-        throw error;
-      });
+  mongoose.connection.once('open', async err => {
+    if (err) throw err;
+    await resetHabiticaDB();
+    done();
   });
 });