Add workaround for Twitter's layout A/B testing

Fixes #110

src/api/cookie.nim

@@ -0,0 +1,16 @@
+import httpclient, strutils
+
+proc getGuestId*(): string =
+  let client = newHttpClient()
+  for i in 0 .. 10:
+    try:
+      let req = client.get("https://twitter.com")
+      if "react-root" in req.body: continue
+      for k, v in req.headers:
+        if "guest_id" in v:
+          return v[v.find("=") + 1 .. v.find(";")]
+    except:
+      discard
+    finally:
+      try: client.close()
+      except: discard