Bump gulp-terser from 1.4.1 to 2.0.0

Bumps [gulp-terser](https://github.com/duan602728596/gulp-terser) from 1.4.1 to 2.0.0.
- [Release notes](https://github.com/duan602728596/gulp-terser/releases)
- [Commits](https://github.com/duan602728596/gulp-terser/compare/v1.4.1...v2.0.0)

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -31,7 +31,7 @@
     "gulp-run": "^1.7.1",
     "gulp-sass": "^4.0.2",
     "gulp-sourcemaps": "^3.0.0",
-    "gulp-terser": "^1.4.1",
+    "gulp-terser": "^2.0.0",
     "localtunnel": "^2.0.0",
     "lodash": "^4.17.20",
     "lodash.template": "^4.5.0",