Bump rollup-plugin-terser from 6.1.0 to 7.0.0 (#320)

Bumps [rollup-plugin-terser](https://github.com/TrySound/rollup-plugin-terser) from 6.1.0 to 7.0.0.
- [Release notes](https://github.com/TrySound/rollup-plugin-terser/releases)
- [Commits](https://github.com/TrySound/rollup-plugin-terser/compare/v6.1.0...v7.0.0)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

package.json

@@ -65,7 +65,7 @@
     "rollup-plugin-babel": "^4.0.3",
     "rollup-plugin-commonjs": "^10.0.0",
     "rollup-plugin-node-resolve": "^5.0.0",
-    "rollup-plugin-terser": "^6.0.0",
+    "rollup-plugin-terser": "^7.0.0",
     "sinon": "^9.0.0",
     "typescript": "^3.5.1"
   }