[REFACT] Parser: make use of context managers for zipfiles

gargantext/util/parsers/_Parser.py

@@ -165,11 +165,10 @@ class Parser:
             file = self._file
         # if the file is a ZIP archive, recurse on each of its files...
         if zipfile.is_zipfile(file):
-            zipArchive = zipfile.ZipFile(file)
+            with zipfile.ZipFile(file) as zipArchive:
                 for filename in zipArchive.namelist():
-                f = zipArchive.open(filename, 'r')
+                    with zipArchive.open(filename) as f:
                         yield from self.__iter__(f)
-                f.close()
         # ...otherwise, let's parse it directly!
         else:
             try: