Update dependency rollup-plugin-terser to v7

Author: renovate[bot]

package.json

@@ -48,7 +48,7 @@
     "rollup-plugin-babel": "^4.4.0",
     "rollup-plugin-commonjs": "^10.1.0",
     "rollup-plugin-node-resolve": "^5.2.0",
-    "rollup-plugin-terser": "^5.3.0",
+    "rollup-plugin-terser": "^7.0.0",
     "ts-jest": "^25.2.1",
     "tslint": "^6.1.0",
     "typescript": "^3.8.3"