tutorial / 10 : fix url to CI servicies

Author: beachdweller

tutorial/10.git.ipynb

@@ -1676,7 +1676,7 @@
    "source": [
     "* In short, [the common practice of **Continuous Integration**](https://en.wikipedia.org/wiki/Continuous_integration#Common_practices) builds and tests the software under development several times a day.<br>간단히 말해 지속적 통합이란 개발중인 소프트웨어를 매일 여러번 build 하고 시험하는 것임.\n",
     "* Such activities would be automated and the test results would be available to all participants.<br>Build 와 시험은 자동화, 시험 결과는 참여자들 사이에 공유됨.\n",
-    "* There are several [CI services](https://github.com/marketplace/category/continuous-integration) available for github.<br>Github과 연계 가능한 여러 CI 서비스가 있음.\n",
+    "* There are several [CI services](https://github.com/marketplace?category=continuous-integration) available for github.<br>Github과 연계 가능한 여러 CI 서비스가 있음.\n",
     "\n"
    ]
   },