Bump grunt-terser from 1.0.0 to 2.0.0 (closes #177)

Bumps [grunt-terser](https://github.com/adascal/grunt-terser) from 1.0.0 to 2.0.0.
- [Release notes](https://github.com/adascal/grunt-terser/releases)
- [Commits](https://github.com/adascal/grunt-terser/commits/v2.0.0)

---
updated-dependencies:
- dependency-name: grunt-terser
  dependency-type: direct:development
  update-type: version-update:semver-major
...

Change-Id: Id1e42f96b70a19f29126c70d15317678b7ff9bce
Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/package.json b/package.json
index bacf810..b5ad5cb 100644
--- a/package.json
+++ b/package.json
@@ -18,7 +18,7 @@
     "grunt-contrib-watch": "^1.1.0",
     "grunt-sass": "^3.1.0",
     "grunt-shell": "^4.0.0",
-    "grunt-terser": "^1.0.0",
+    "grunt-terser": "^2.0.0",
     "imagemin": "^8.0.1",
     "optipng-bin": "^9.0.0",
     "sass": "^1.44.0",