Fix luacheck warnings and small README addition

README.md

@@ -221,6 +221,9 @@ Constructor for the OpenAI client.
 local openai = require("openai")
 local api_key = "your-api-key"
 local client = openai.new(api_key)
+
+--optionally provide an alternate API URL
+client.api_base = "http://my_llama_cpp.local/v1"
 ```
 
 ##### `client:new_chat_session(...)`

examples/example2.lua

@@ -15,13 +15,13 @@ print(chat:send("List your top 5 favorite colors"))
 print(chat:send("Excluding the colors you just listed, tell me your favorite color"))
 
 -- the entire chat history is stored in the messages field
-for idx, message in ipairs(chat.messages) do
+for _, message in ipairs(chat.messages) do
   print(message.role, message.content)
 end
 
 -- You can stream the output by providing a callback as the second argument
 -- the full response concatenated is also returned by the function
-local response = chat:send("What's the most boring color?", function(chunk)
+local _ = chat:send("What's the most boring color?", function(chunk)
   io.stdout:write(chunk.content)
   io.stdout:flush()
 end)

examples/example5.lua

@@ -34,7 +34,8 @@ local chat = client:new_chat_session({
   messages = {
     {
       role = "system",
-      content = "You are a calculator with access to specified set of functions. All computation should be done with the functions"
+      content =
+		"You are a calculator with access to specified set of functions. All computation should be done with the functions"
     }
   },
   functions = {

openai/init.lua

@@ -229,7 +229,7 @@ do
     new_chat_session = function(self, ...)
       return ChatSession(self, ...)
     end,
-    create_stream_filter = function(self, chunk_callback)
+    create_stream_filter = function(_, chunk_callback)
       assert(types["function"](chunk_callback), "Must provide chunk_callback function when streaming response")
       local accumulation_buffer = ""
       return function(...)