pcp-geolocate: make it work with older versions of python

Avoids "TypeError: the JSON object must be str, not 'bytes'" with
(at least) python 3.5 and 2.7.

src/pcp/geolocate/pcp-geolocate.py

@@ -62,7 +62,8 @@ def finish(url):
 
 def ipinfo(url):
     with httprequest.urlopen(url) as http:
-        data = json.load(http)
+        js = http.read().decode('utf-8')
+        data = json.loads(js)
         coords = data['loc'].split(',')
         print(output % (coords[0], coords[1]))
     finish(url)
@@ -73,7 +74,8 @@ def ipinfo(url):
 
 def mozilla(url):
     with httprequest.urlopen(url) as http:
-        data = json.load(http)
+        js = http.read().decode('utf-8')
+        data = json.loads(js)
         coords = data['location']
         print(output % (coords['lat'], coords['lng']))
     finish(url)