[options] Add missing spaces

youtube_dl/options.py

@@ -298,14 +298,14 @@ def parseOpts(overrideArguments=None):
         metavar='FILTER', dest='match_filter', default=None,
         help=(
             'Generic video filter. '
-            'Specify any key (see help for -o for a list of available keys) to'
-            ' match if the key is present, '
-            '!key to check if the key is not present,'
+            'Specify any key (see help for -o for a list of available keys) to '
+            'match if the key is present, '
+            '!key to check if the key is not present, '
             'key > NUMBER (like "comment_count > 12", also works with '
             '>=, <, <=, !=, =) to compare against a number, and '
             '& to require multiple matches. '
-            'Values which are not known are excluded unless you'
-            ' put a question mark (?) after the operator.'
+            'Values which are not known are excluded unless you '
+            'put a question mark (?) after the operator. '
             'For example, to only match videos that have been liked more than '
             '100 times and disliked less than 50 times (or the dislike '
             'functionality is not available at the given service), but who '