Pass freedom units of temperature measurement through Math.round().

Use 'dt' value of API response to determine whether to update cache, rather than time since last fetch.  New data may appear sooner.

exec/load/openweathermap.js

@@ -21,7 +21,7 @@ OpenWeatherMap.prototype.write_cache = function (endpoint, params, response) {
     const hash = base64_encode(endpoint + JSON.stringify(params));
     cache_file = new File(system.temp_dir + 'openweathermap_' + hash + '.json');
     cache_file.open('w');
-    cache_file.write(JSON.stringify({ time: time(), data: response }));
+    cache_file.write(JSON.stringify(response));
     cache_file.close();
 }
 
@@ -33,8 +33,8 @@ OpenWeatherMap.prototype.read_cache = function (endpoint, params) {
     const cache = JSON.parse(cache_file.read());
     cache_file.close();
     // This is probably not the right way, but it'll do
-    if (time() - cache.time > this.settings.data_refresh) return;
-    return cache.data;
+    if (time() - cache.dt > this.settings.data_refresh) return;
+    return cache;
 }
 
 OpenWeatherMap.prototype.rate_limit = function () {
@@ -102,5 +102,5 @@ OpenWeatherMap.prototype.wind_direction = function (deg) {
 }
 
 OpenWeatherMap.prototype.c_to_f = function (c) {
-    return (c * (9/5)) + 32;
+    return Math.round((c * (9/5)) + 32);
 }