pylint: Bring -f/--format arg completion up to date with pylint 1.9.2

Author: scop

completions/pylint

@@ -57,7 +57,7 @@ _pylint()
             return
             ;;
         --format|-!(-*)f)
-            COMPREPLY=( $( compgen -W 'text parseable colorized msvs html' \
+            COMPREPLY=( $( compgen -W 'text parseable colorized json msvs' \
                 -- "$cur" ) )
             return
             ;;