Update dependency terser to v5

Author: renovate-bot

package.json

@@ -142,7 +142,7 @@
     "sinon": "9.0.2",
     "sinon-chai": "3.5.0",
     "source-map-loader": "1.0.1",
-    "terser": "4.8.0",
+    "terser": "5.1.0",
     "ts-loader": "6.2.2",
     "ts-node": "8.10.2",
     "tslint": "6.1.3",

yarn.lock

@@ -14820,7 +14820,16 @@ terser-webpack-plugin@^1.4.3:
     webpack-sources "^1.4.0"
     worker-farm "^1.7.0"
 
-[email protected], terser@^4.1.2, terser@^4.7.0:
+[email protected]:
+  version "5.1.0"
+  resolved "https://registry.npmjs.org/terser/-/terser-5.1.0.tgz#1f4ab81c8619654fdded51f3157b001e1747281d"
+  integrity sha512-pwC1Jbzahz1ZPU87NQ8B3g5pKbhyJSiHih4gLH6WZiPU8mmS1IlGbB0A2Nuvkj/LCNsgIKctg6GkYwWCeTvXZQ==
+  dependencies:
+    commander "^2.20.0"
+    source-map "~0.6.1"
+    source-map-support "~0.5.12"
+
+terser@^4.1.2, terser@^4.7.0:
   version "4.8.0"
   resolved "https://registry.npmjs.org/terser/-/terser-4.8.0.tgz#63056343d7c70bb29f3af665865a46fe03a0df17"
   integrity sha512-EAPipTNeWsb/3wLPeup1tVPaXfIaU68xMnVdPafIL1TV05OhASArYyIfFvnvJCNrR2NIOvDVNNTFRa+Re2MWyw==