fix: nicks count check and option rename

Author: crpmax

README.md

@@ -36,7 +36,7 @@ When running, you can write a chat message to the terminal to send it by all bot
 `-t` Set proxy type - SOCKS4 or SOCKS5  
 `-l` Set proxy list file  
 `-g` Try to simulate gravity by falling down  
-`-nicks` Set nicknames file  
+`--nicks` Set nicknames file  
 
 ## ⚠ DISCLAIMER
 **This app is made for educational and testing purposes only.  

src/main/java/me/creepermaxcz/mcbots/Main.java

@@ -63,7 +63,7 @@ public static void main(String[] args) throws Exception {
         options.addOption("l", "proxy-list", true, "Path or URL to proxy list file with proxy:port on every line");
         options.addOption("t", "proxy-type", true, "Proxy type: SOCKS4 or SOCKS5");
 
-        options.addOption("nicks", true, "Path to nicks file with nick on every line");
+        options.addOption(null, "nicks", true, "Path to nicks file with nick on every line");
 
         options.addOption("g", "gravity", false, "Try to simulate gravity by falling down");
 
@@ -198,6 +198,12 @@ public static void main(String[] args) throws Exception {
         if (cmd.hasOption("nicks")) {
             Log.info("Loading nicknames from specified file");
             int nicksCount = nickGen.loadFromFile(cmd.getOptionValue("nicks"));
+
+            if (nicksCount == 0) {
+                Log.error("No valid nicknames loaded");
+                System.exit(1);
+            }
+
             if (nicksCount < botCount) {
                 Log.warn("Nickname count is lower than bot count!");
                 Thread.sleep(3000);