Update package.json

Update major version of Semantic Release to v15. This matches PRs submitted to the other PatternFly repos, in relation to issue patternfly/patternfly#876 relating to broken HTML in the release notes.

Author: Adam Jolicoeur

package.json

@@ -61,7 +61,7 @@
     "nsp": "^2.6.1",
     "patternfly-eng-release": "^3.26.54",
     "qs": "^1.0.0",
-    "semantic-release": "^6.3.6",
+    "semantic-release": "^15.0.0",
     "send": "^0.11.1",
     "uglify-js": "^2.6.0"
   },