chore(package): update @semantic-release/release-notes-generator to version 7.3.4

Closes #25

Author: greenkeeper[bot]

package.json

@@ -47,7 +47,7 @@
     "rxjs": "^5.5.7"
   },
   "devDependencies": {
-    "@semantic-release/release-notes-generator": "^6.0.12",
+    "@semantic-release/release-notes-generator": "^7.3.4",
     "@types/lokijs": "^1.5.2",
     "@types/ramda": "github:types/npm-ramda#dist",
     "ava": "^0.25.0",