fix(package): update http-proxy-agent to version 3.0.0

Author: greenkeeper[bot]

package.json

@@ -24,7 +24,7 @@
     "dir-glob": "^3.0.0",
     "fs-extra": "^8.0.0",
     "globby": "^10.0.0",
-    "http-proxy-agent": "^2.1.0",
+    "http-proxy-agent": "^3.0.0",
     "https-proxy-agent": "^3.0.0",
     "issue-parser": "^5.0.0",
     "lodash": "^4.17.4",