Support npm-shrinkwrap.json out-of-the-box (#439)

src/cache-utils.ts

@@ -13,7 +13,7 @@ export interface PackageManagerInfo {
 
 export const supportedPackageManagers: SupportedPackageManagers = {
   npm: {
-    lockFilePatterns: ['package-lock.json', 'yarn.lock'],
+    lockFilePatterns: ['package-lock.json', 'npm-shrinkwrap.json', 'yarn.lock'],
     getCacheFolderCommand: 'npm config get cache'
   },
   pnpm: {