chore(deps-dev): bump ejs from 2.6.1 to 3.1.7

Bumps [ejs](https://github.com/mde/ejs) from 2.6.1 to 3.1.7.
- [Release notes](https://github.com/mde/ejs/releases)
- [Commits](mde/ejs@v2.6.1...v3.1.7)

---
updated-dependencies:
- dependency-name: ejs
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

package-lock.json

@@ -18,7 +18,7 @@
     "babel-cli": "^6.26.0",
     "babel-preset-env": "^1.6.1",
     "chalk": "latest",
-    "ejs": "^2.5.7",
+    "ejs": "^3.1.7",
     "hast-util-from-parse5": "latest",
     "hast-util-to-mdast": "^2.1.0",
     "jstransformer-ejs": "0.0.3",