fix(is-ignored): move types to dev dependencies (#897)

Author: byCedric

@commitlint/is-ignored/package.json

@@ -36,10 +36,10 @@
   "devDependencies": {
     "@commitlint/parse": "^8.3.4",
     "@commitlint/test": "8.2.0",
-    "@commitlint/utils": "^8.3.4"
+    "@commitlint/utils": "^8.3.4",
+    "@types/semver": "^6.0.1"
   },
   "dependencies": {
-    "@types/semver": "^6.0.1",
     "semver": "6.3.0"
   }
 }