Avoid deprecated pandas method and bump version (#27)

* Avoid deprecated `pd.DataFrame.append`

Closes #16

* Bump to version 1.1.3

Author: michaelosthege

bletl/__init__.py

@@ -19,4 +19,4 @@
     NoMeasurementData,
 )
 
-__version__ = "1.1.2"
+__version__ = "1.1.3"

bletl/types.py

@@ -83,7 +83,7 @@ def get_narrow_data(self) -> pandas.DataFrame:
             to_add["value"] = pandas.melt(filtertimeseries.value, value_name="value").loc[:, "value"]
             to_add["filterset"] = filterset
             to_add.astype({"value": float})
-            narrow = narrow.append(to_add, sort=False)
+            narrow = pandas.concat([narrow, to_add], sort=False)
 
         return narrow.reset_index()