Environment Variable Validation (#122)

* Update: env validation and discord token validation

* Add: IPv4 Address Validation

* Update: version increment

docker-compose.yml

@@ -7,7 +7,7 @@ services:
     build: ./                     # find docker file in designated path
     container_name: discord
     restart: always               # rebuild container always
-    image: kevinthedang/discord-ollama:0.6.0
+    image: kevinthedang/discord-ollama:0.6.1
     environment:
       CLIENT_TOKEN: ${CLIENT_TOKEN}
       MODEL: ${MODEL}