Added user flag to npm install in README

Author: Michael Smathers

README.md

@@ -15,7 +15,7 @@ Users browse streams and nodes in the web UI, and activate (stream, node) pairs
 
 1) Install via npm
 
-    npm install -g log.io
+    npm install -g log.io --user "ubuntu"
 
 2) Run server
 
@@ -83,4 +83,4 @@ Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
-limitations under the License.
+limitations under the License.