fix(package): update issue-parser to version 6.0.0

Author: greenkeeper[bot]

package.json

@@ -26,7 +26,7 @@
     "globby": "^10.0.0",
     "http-proxy-agent": "^3.0.0",
     "https-proxy-agent": "^4.0.0",
-    "issue-parser": "^5.0.0",
+    "issue-parser": "^6.0.0",
     "lodash": "^4.17.4",
     "mime": "^2.4.3",
     "p-filter": "^2.0.0",