Make sure column names are all uppercase

Before, the CSV files jumped to using DATE as a column to using Date.

chimet-scraper.py

@@ -182,6 +182,20 @@ def daterange(from_time, to_time) -> typing.List[datetime.datetime]:
 
     return dates
 
+def uppercase_columns(pandas_dataset):
+    """Makes sure all the column names are uppercase
+
+    Arguments:
+        pandas_dataset:
+            The dataset to uppercase column names of.
+            Warning, this modifies this object.
+
+    Returns:
+        The dataset with uppercase column names.
+    """
+    pandas_dataset.columns = pandas_dataset.columns.str.upper()
+    return pandas_dataset
+
 def combine_csvs(input_csv_files: list, output_loc):
     """Combines the given csv files into one big one.
     
@@ -191,7 +205,8 @@ def combine_csvs(input_csv_files: list, output_loc):
         input_csv_files: The list of csv files to combine.
         output_loc: Where the save the combined csv file.
     """
-    combined = pd.concat([pd.read_csv(f) for f in input_csv_files])
+    combined = pd.concat([uppercase_columns(pd.read_csv(f))
+                          for f in input_csv_files])
     combined.to_csv(output_loc, index=False, encoding='utf-8')
 
 def make_csv(location: Locations,