Add node modules and new code for release (#57)

Co-authored-by: taakleton <taakleton@users.noreply.github.com>

node_modules/istanbul-lib-source-maps/package.json

@@ -0,0 +1,45 @@
+{
+  "name": "istanbul-lib-source-maps",
+  "version": "4.0.1",
+  "description": "Source maps support for istanbul",
+  "author": "Krishnan Anantheswaran <kananthmail-github@yahoo.com>",
+  "main": "index.js",
+  "files": [
+    "lib",
+    "index.js"
+  ],
+  "scripts": {
+    "test": "nyc mocha"
+  },
+  "dependencies": {
+    "debug": "^4.1.1",
+    "istanbul-lib-coverage": "^3.0.0",
+    "source-map": "^0.6.1"
+  },
+  "devDependencies": {
+    "chai": "^4.2.0",
+    "mocha": "^6.2.2",
+    "nyc": "^15.0.0-beta.2",
+    "ts-node": "^8.5.4"
+  },
+  "license": "BSD-3-Clause",
+  "bugs": {
+    "url": "https://github.com/istanbuljs/istanbuljs/issues"
+  },
+  "homepage": "https://istanbul.js.org/",
+  "repository": {
+    "type": "git",
+    "url": "git+ssh://git@github.com/istanbuljs/istanbuljs.git",
+    "directory": "packages/istanbul-lib-source-maps"
+  },
+  "keywords": [
+    "istanbul",
+    "sourcemaps",
+    "sourcemap",
+    "source",
+    "maps"
+  ],
+  "engines": {
+    "node": ">=10"
+  }
+}