docs: add node-etcd-config to libs and tools doc

Documentation/libraries-and-tools.md

@@ -33,6 +33,7 @@
 
 - [stianeikeland/node-etcd](https://github.com/stianeikeland/node-etcd) - Supports v2 (w Coffeescript)
 - [lavagetto/nodejs-etcd](https://github.com/lavagetto/nodejs-etcd) - Supports v2
+- [deedubs/node-etcd-config](https://github.com/deedubs/node-etcd-config) - Supports v2
 
 **Ruby libraries**
 
@@ -72,7 +73,7 @@
 **R libraries**
 
 - [ropensci/etseed](https://github.com/ropensci/etseed)
- 
+
 **Tcl libraries**
 
 - [efrecon/etcd-tcl](https://github.com/efrecon/etcd-tcl) - Supports v2, except wait.