Update CHANGELOG.MD

CHANGELOG.MD

@@ -1,10 +1,16 @@
+# v0.1.1
+### Features
+* A new method has been added which checks if an extension belongs to a Microsoft Excel file
+### Fixes
+* In the csvToExcel method, the CSVReader object was not closed at the end of the operation
+* The objectsToExcel method did not check if the extension of the output file was correct
+
 # v0.1.0
 This is the first release.
-
 ### Features
 * Converting a list of objects into an Excel file and vice versa
 * Converting an Excel file to a CSV file and vice versa
 * Utility methods which count all rows of one or more sheets and which check if an extension belongs to an Excel file
 * Methods for opening, creating or closing a Workbook
-* Methods to open, create or close a Sheet. 
+* Methods to open, create or close a Sheet.
 * Methods for retrieving a sheet or information relating to a sheet