updated mongodb installation

README.md

@@ -41,6 +41,14 @@ The following steps were reproduced in that order on a fully updated Ubuntu 15.1
     sudo systemctl restart mongodb
     mongo
     ```
+    if running from inside a VM, rebind MongoDB host:
+    ```bash
+    nano /etc/mongodb.conf
+    # comment out line:
+    # bind_ip = 127.0.0.1
+    # save
+    sudo systemctl restart mongodb
+    ```
     
     if watchman will be used (see below) additional packages are required for building watchman from source
     ```bash