closed #36

- indices functions for data retrieval added to investpy
- tests/ updated in order to improve codecov by covering indices retrieval functions
- tests/test_investpy.py functions splitted in order to be more clear
- coversion to dict and json objects added to Data class
- docs/ generated

investpy/Data.py

@@ -98,3 +98,25 @@ def etf_as_json(self):
             'close': self.close,
             'currency': self.currency,
         }
+
+    def index_to_dict(self):
+        return {
+            'Date': self.date,
+            'Open': self.open,
+            'High': self.high,
+            'Low': self.low,
+            'Close': self.close,
+            'Volume': self.volume,
+            'Currency': self.currency,
+        }
+
+    def index_as_json(self):
+        return {
+            'date': self.date.strftime('%d/%m/%Y'),
+            'open': self.open,
+            'high': self.high,
+            'low': self.low,
+            'close': self.close,
+            'volume': self.volume,
+            'currency': self.currency,
+        }