Allow DB_HOST to be configured from .env

.env.example

@@ -1,10 +1,13 @@
 SECRET=SECRET
 EMAILHOST=smtp.elasticemail.com
 EMAILPORT=2525
-EMAILUSER=email@andela.com
+EMAILUSER=email@123.com
 EMAILPASS=pass
 DB_NAME=DB_DATABASE_NAME
 DB_NAME_TEST=TEST_DB
 DB_USER=DB_USERNAME
 DB_PASSWORD=DB_PASSWORD
+DB_HOST=127.0.0.1
 DEFAULT_ARTICLE_IMAGE='https://images.pexels.com/photos/1047540/pexels-photo-1047540.jpeg?dl&fit=crop&crop=entropy&w=1280&h=853'
+PORT=80
+PASSWORD=12345

src/db/config/config.js

@@ -2,28 +2,28 @@ const dotenv = require('dotenv');
 
 dotenv.config();
 const {
-  DB_USER, DB_NAME, DB_PASSWORD, DB_NAME_TEST
+  DB_USER, DB_NAME, DB_PASSWORD, DB_NAME_TEST, DB_HOST,
 } = process.env;
 module.exports = {
   development: {
     username: DB_USER,
     password: DB_PASSWORD,
     database: DB_NAME,
-    host: '127.0.0.1',
+    host: DB_HOST,
     dialect: 'postgres'
   },
   test: {
     username: DB_USER,
     password: DB_PASSWORD,
     database: DB_NAME_TEST,
-    host: '127.0.0.1',
+    host: DB_HOST,
     dialect: 'postgres'
   },
   production: {
     username: 'root',
     password: null,
     database: 'database_production',
-    host: '127.0.0.1',
+    host: DB_HOST,
     dialect: 'postgres'
   }
 };