test: add code coverage report

.gitignore

@@ -2,3 +2,5 @@ _versions.ts
 node_modules
 .idea
 /ng-appversion.iml
+.nyc_output
+coverage

package.json

@@ -8,7 +8,7 @@
   },
   "scripts": {
     "start": "node index.js",
-    "test": "./node_modules/mocha/bin/mocha",
+    "test": "nyc --reporter=text --reporter=lcov mocha",
     "snyk-protect": "snyk protect",
     "prepare": "npm run snyk-protect",
     "semantic-release": "semantic-release",
@@ -27,8 +27,8 @@
     "colors": "^1.3.3",
     "git-commit-info": "^1.0.0",
     "git-describe": "^4.0.4",
-    "yargs": "^14.1.0",
-    "snyk": "^1.298.1"
+    "snyk": "^1.298.1",
+    "yargs": "^14.1.0"
   },
   "devDependencies": {
     "@saithodev/semantic-release-sharedconf-npm": "^2.0.1",
@@ -37,6 +37,7 @@
     "cz-conventional-changelog": "^3.0.2",
     "lodash": "^4.17.15",
     "mocha": "^6.2.0",
+    "nyc": "^15.0.0",
     "rimraf": "^3.0.0",
     "semantic-release": "^16.0.1"
   },