Better configuration (#79)

* Configurable Transport (#75)

* new functions to allow HTTPClient configuration

* updated go.mod for testing from remote

* updated go.mod for remote testing

* revert go.mod replace directives

* Fixed NewOrgClientWithTransport comment

* Make client fully configurable

* make empty messages limit configurable #70 #71

* make auth token private in config

* add docs

* lint

---------

Co-authored-by: Michael Fox <m.will.fox@gmail.com>

completion_test.go

@@ -25,9 +25,10 @@ func TestCompletions(t *testing.T) {
 	ts.Start()
 	defer ts.Close()
 
-	client := NewClient(test.GetTestToken())
+	config := DefaultConfig(test.GetTestToken())
+	config.BaseURL = ts.URL + "/v1"
+	client := NewClientWithConfig(config)
 	ctx := context.Background()
-	client.BaseURL = ts.URL + "/v1"
 
 	req := CompletionRequest{
 		MaxTokens: 5,