Switch to ES6 modules, change test behavior

Now project is using ES6 modules and displays coverage reports for
browser tests (made via karma), while nodejs tests only keygens.

package.json

@@ -3,29 +3,31 @@
   "version": "2.0.0",
   "description": "Password generator for BIOS",
   "main": "src/ui.ts",
-  "browserlist": "> 0.25%, not dead",
+  "browserslist": "> 0.25%, not dead",
   "dependencies": {
     "jsbi": "^3.1.3"
   },
   "devDependencies": {
     "@babel/core": "^7.10.2",
     "@babel/preset-env": "^7.10.2",
+    "@jsdevtools/coverage-istanbul-loader": "^3.0.3",
     "@types/jasmine": "^3.5.10",
     "babel-loader": "^8.1.0",
     "clean-webpack-plugin": "^3.0.0",
     "copy-webpack-plugin": "^5.1.1",
     "coveralls": "^3.1.0",
+    "esm": "^3.2.25",
     "html-webpack-plugin": "^3.2.0",
     "jasmine": "^3.5.0",
     "jasmine-spec-reporter": "^5.0.2",
     "karma": "^5.0.9",
     "karma-chrome-launcher": "^3.1.0",
+    "karma-coverage-istanbul-reporter": "^3.0.3",
     "karma-firefox-launcher": "^1.3.0",
     "karma-jasmine": "^3.3.1",
     "karma-sauce-launcher": "^1.2.0",
     "karma-sourcemap-loader": "^0.3.7",
     "karma-webpack": "^4.0.2",
-    "nyc": "^15.1.0",
     "terser-webpack-plugin": "^3.0.3",
     "ts-loader": "^6.2.2",
     "ts-node": "^8.10.2",
@@ -36,14 +38,12 @@
     "webpack-dev-server": "^3.11.0"
   },
   "scripts": {
-    "test": "ts-node ./node_modules/jasmine/bin/jasmine --config=jasmine.json",
+    "test": "node -r esm -r ts-node/register node_modules/.bin/jasmine --config=jasmine.json",
+    "browser-test": "karma start",
     "lint": "tslint src/**/*.ts",
-    "cover": "nyc -r text -e .ts -x '**/*.spec.ts' npm test",
-    "send-coverage": "nyc report --reporter=text-lcov | coveralls",
-    "all": "npm test && npm run lint && npm run cover && npm run browser-test",
+    "all": "npm test && npm run lint && npm run browser-test",
     "build-prod": "PRODUCTION=1 GOOGLE_ANALYTICS_TAG=UA-112154345-1 webpack",
     "build-stage": "PRODUCTION=1 GOOGLE_ANALYTICS_TAG=UA-112154345-2 webpack",
-    "browser-test": "karma start",
     "webpack": "webpack",
     "dev-server": "webpack-dev-server"
   },