fix: change depreacted CI var in gitlab ci conf file

package.json

@@ -7,7 +7,7 @@
     "doc": "docs"
   },
   "scripts": {
-    "precommit": "conventional-changelog -i CHANGELOG -s -r 0",
+    "precommit": "conventional-changelog -i CHANGELOG.md -s -r 0",
     "test": "echo \"Error: no test specified\" && exit 1",
     "commitmsg": "commitlint -e $GIT_PARAMS",
     "changelog": "conventional-changelog -p angular -i CHANGELOG.md -s -r 0",