make installable from git

make prepare husky key _prepare so it doesn't run on ci servers

See typicode/husky#851 (comment)

Do not publish this. Just for internal use to get builds working

package.json

@@ -47,7 +47,7 @@
     "test": "npx ava --verbose",
     "lint-staged": "lint-staged",
     "coverage": "npx nyc ava && npx nyc report --reporter=json-summary && cp coverage/coverage-summary.json docs-src/_data/coverage.json && node cmd.js --config=docs-src/.eleventy.docs.js",
-    "prepare": "husky install"
+    "_prepare": "husky install"
   },
   "author": {
     "name": "Zach Leatherman",