Use raw.githack.com instead of the now defunct rawgit.com in Travis checks.

Author: gkellogg

.travis.yml

@@ -29,7 +29,7 @@ jobs:
       rvm: 2.6
       script:
         - docker pull stupchiy/checklink
-        - docker run -it stupchiy/checklink -b -X '(http|https|mailto):' "https://labs.w3.org/spec-generator/?type=respec&url=https://rawgit.com/w3c/json-ld-api/${TRAVIS_BRANCH}/index.html?specStatus=WD&shortName=json-ld11-api"
+        - docker run -it stupchiy/checklink -b -X '(http|https|mailto):' "https://labs.w3.org/spec-generator/?type=respec&url=https://raw.githack.com/w3c/json-ld-api/${TRAVIS_BRANCH}/index.html?specStatus=WD&shortName=json-ld11-api"
         - bundle exec rake check_html
     - stage: echidna
       name: "Echidna Publication"