Get subreddit by name

Signed-off-by: Vartan Benohanian <vartanbeno@gmail.com>

geddit_opts.go

@@ -0,0 +1,14 @@
+package geddit
+
+import "fmt"
+
+// Opt is a configuration option to initialize a client
+type Opt func(*Client) error
+
+// WithUserAgent sets the user agent for the client
+func WithUserAgent(ua string) Opt {
+	return func(c *Client) error {
+		c.UserAgent = fmt.Sprintf("%s %s", ua, c.UserAgent)
+		return nil
+	}
+}