Added option to cache prices

EngieApi/Contracts.py

@@ -8,7 +8,7 @@ from EngieApi.EngieAPI import EngieAPI
 
 
 class Dynamic:
-    def __init__(self, btw=1.21):
+    def __init__(self, btw=1.21, cache: bool = False):
         self.btw = btw
         self.vast = 100.7  # EUR / jaar
 
@@ -22,6 +22,7 @@ class Dynamic:
         # 20000 < kwh < 50000: 1.22748 cent / kWh
         # 50000 < kwh < 100000: 1.15540 cent / kWh
         self.federale_accijns = 0.0144160  # EUR / kWh
+        self.cache = cache
 
     def calculate_price_per_kwh(self, date, peak: float):
         """calculate_price_per_kwh
@@ -29,7 +30,7 @@ class Dynamic:
         :param date: date to calculate for
         :type date: date
         """
-        api = EngieAPI()
+        api = EngieAPI(cache=self.cache)
         epex_spot = np.array(api.get_epex_spot(date))
 
         prijs = 0.2040 + 0.1 * (epex_spot)  # zonder BTW per Cent/kWh