Add documentation about deps

NEWS

@@ -70,6 +70,7 @@ Backward-incompatible changes:
     * Support for psutil < 5.3.0 has been dropped
     * Minimum supported Docker API version is now 1.21 (Docker plugins)
     * Support for InfluxDB < 0.9 is deprecated (InfluxDB exporter)
+    * Zeroconf lib should be pinned to 0.19.1 for Python 2.x 
     * --disable-<plugin> no longer available (use --disable-plugin <plugin>)
     * --export-<exporter> no longer available (use --export <exporter>)
 

optional-requirements.txt

@@ -21,4 +21,5 @@ requests
 scandir; python_version < "3.5"
 statsd
 wifi
-zeroconf
+zeroconf==0.19.1; python_version < "3.0"
+zeroconf; python_version >= "3.0"

unitest-restful.py

@@ -32,7 +32,8 @@ from glances.compat import text_type
 import requests
 
 SERVER_PORT = 61234
-URL = "http://localhost:%s/api/2" % SERVER_PORT
+API_VERSION = 2
+URL = "http://localhost:{}/api/{}".format(SERVER_PORT, API_VERSION)
 pid = None
 
 # Unitest class