add a function to collect humidity

sensors/collector/collector.py

@@ -19,4 +19,5 @@ def get_pressure():
 
 
 def get_humidity():
-    return sense.get_humidity()
+    raw_humidity = sense.get_humidity()
+    return round(raw_humidity, 1)

sensors/collector/tests/test_collector.py

@@ -16,6 +16,14 @@ def test_temp_collector(monkeypatch):
     assert collector.get_temperature() == 25.3
 
 
+def test_humidity_collector(monkeypatch):
+    def mock_humidity():
+        return 45.2356
+
+    monkeypatch.setattr(collector.sense, 'get_humidity', mock_humidity)
+    assert collector.get_humidity() == 45.2
+
+
 def test_pressure_collector(monkeypatch):
     def mock_pressure():
         return 1013.345