update readme, add missing line to the invalid parameters message output

Author: jmansar

README.md

@@ -28,8 +28,6 @@ pacman -S libwebsockets
 ```
 
 2. Download the archive from the releases page, extract it and copy the executable to your selected directory.
-> **Note:** This application is still under development and has not been released.
-
 
 ## Usage
 

main.c

@@ -276,7 +276,7 @@ int main(int argc, const char **argv) {
 
   if (!(button_id = lws_cmdline_option(argc, argv, "--button-id"))) {
     printf("Invalid parameters.\n");
-    printf("Use: \"tshotkeytrigger --help\" to see the correct usage.");
+    printf("Use: \"tshotkeytrigger --help\" to see the correct usage.\n");
 
     return ERR_PARAMETERS;
   }