Round humidity for display purposes (#12766)

Humidity was not being rounded as temperature was. This change fixes
that.

homeassistant/components/weather/__init__.py

@@ -110,7 +110,7 @@ class WeatherEntity(Entity):
             ATTR_WEATHER_TEMPERATURE: show_temp(
                 self.hass, self.temperature, self.temperature_unit,
                 self.precision),
-            ATTR_WEATHER_HUMIDITY: self.humidity,
+            ATTR_WEATHER_HUMIDITY: round(self.humidity)
         }
 
         ozone = self.ozone

homeassistant/components/weather/darksky.py

@@ -96,7 +96,7 @@ class DarkSkyWeather(WeatherEntity):
     @property
     def humidity(self):
         """Return the humidity."""
-        return round(self._ds_currently.get('humidity') * 100.0, 2)
+        return self._ds_currently.get('humidity') * 100.0
 
     @property
     def wind_speed(self):

homeassistant/helpers/temperature.py

@@ -3,11 +3,12 @@ from numbers import Number
 
 from homeassistant.core import HomeAssistant
 from homeassistant.util.temperature import convert as convert_temperature
+from homeassistant.const import PRECISION_HALVES, PRECISION_TENTHS
 
 
 def display_temp(hass: HomeAssistant, temperature: float, unit: str,
                  precision: float) -> float:
-    """Convert temperature into preferred units for display purposes."""
+    """Convert temperature into preferred units/precision for display."""
     temperature_unit = unit
     ha_unit = hass.config.units.temperature_unit
 
@@ -25,9 +26,12 @@ def display_temp(hass: HomeAssistant, temperature: float, unit: str,
             temperature, temperature_unit, ha_unit)
 
     # Round in the units appropriate
-    if precision == 0.5:
-        return round(temperature * 2) / 2.0
-    elif precision == 0.1:
-        return round(temperature, 1)
+    if precision == PRECISION_HALVES:
+        temperature = round(temperature * 2) / 2.0
+    elif precision == PRECISION_TENTHS:
+        temperature = round(temperature, 1)
     # Integer as a fall back (PRECISION_WHOLE)
-    return round(temperature)
+    else:
+        temperature = round(temperature)
+
+    return temperature