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

Author: greenkeeper[bot]

package.json

@@ -25,7 +25,7 @@
     "fs-extra": "^8.0.0",
     "globby": "^10.0.0",
     "http-proxy-agent": "^2.1.0",
-    "https-proxy-agent": "^2.2.1",
+    "https-proxy-agent": "^3.0.0",
     "issue-parser": "^4.0.0",
     "lodash": "^4.17.4",
     "mime": "^2.4.3",