Doubled the character limit on timeline posts

Now, you won't have to fight an arbitrary character limit on posts like Twitter, and you can pack more meaning into your messages without having to split them into multiple messages.

Signed-off-by: Andrea Maria Piana <andrea.maria.piana@gmail.com>

Author: Du Cheng

src/status_im/ui/screens/status/new/views.cljs

@@ -43,7 +43,7 @@
         ^{:key (str "image" img)}
         [image-preview img])]]))
 
-(def message-max-lenght 300)
+(def message-max-lenght 600)
 
 (defn my-status []
   (let [images-opened (reagent/atom false)