account: Update online help wrt --avatar & --header flags
Support for inline base64-encoded images removed since it does not work
well and is not advised.
(See PR https://github.com/tootsuite/documentation/pull/317)
--- a/cmd/accounts.go Mon Apr 30 18:54:06 2018 +0200
+++ b/cmd/accounts.go Mon May 28 20:55:51 2018 +0200
@@ -270,8 +270,7 @@
Long: `Update connected user account
All flags are optional (set to an empty string if you want to delete a field).
-The flags --avatar and --header can be paths to image files or base64-encoded
-images (see Mastodon API specifications for the details).
+The options --avatar and --header should be paths to image files.
Please note the avatar and header images cannot be removed, they can only be
replaced.`,