Update httpcore test to use https as well

tests/httpcore_test.py

@@ -6,8 +6,10 @@ async def main():
     # Note: this test only works because we have our own version of httpcore that
     # implements a structio-compatible backend. It's just an example anyway
     pool = httpcore.AsyncConnectionPool()
-    print(await pool.request("GET", "http://example.com"))
-    # TODO: SSL support
+    http = await pool.request("GET", "http://example.com")
+    https = await pool.request("GET", "https://example.com")
+    assert http.status == 200
+    assert https.status == 200
 
 
 structio.run(main)