remove condition node plugin

Author: bahmutov

package.json

@@ -51,7 +51,6 @@
     "update-notifier": "0.5.0"
   },
   "devDependencies": {
-    "condition-node-version": "1.3.0",
     "coveralls": "2.11.4",
     "git-issues": "1.3.1",
     "github-post-release": "1.12.1",
@@ -104,10 +103,6 @@
   "preferGlobal": true,
   "readmeFilename": "README.md",
   "release": {
-    "verifyConditions": {
-      "path": "condition-node-version",
-      "node": "6"
-    },
     "analyzeCommits": "simple-commit-message",
     "generateNotes": "github-post-release"
   },