support node 12+. fix security vulnerabilities re: npm audit

.circleci/config.yml

@@ -4,7 +4,7 @@ orbs:
 jobs:
   lintandcoverage:
     docker:
-      - image: cimg/node:16.10.0
+      - image: cimg/node:16.13.2
     steps:
       - checkout
       - run: npm install
@@ -16,20 +16,17 @@ workflows:
     jobs:
       - lintandcoverage
       - node/test:
-          version: '10.24.1'
-          pkg-manager: npm
-      - node/test:
-          version: '11.14.0'
+          version: '12.22.6'
           pkg-manager: npm
       - node/test:
-          version: '12.22.6'
+          version: '14.19.0'
           pkg-manager: npm
       - node/test:
-          version: '13.14.0'
+          version: '15.14.0'
           pkg-manager: npm
       - node/test:
-          version: '14.18.0'
+          version: '16.13.2'
           pkg-manager: npm
       - node/test:
-          version: '15.14.0'
+          version: '17.4.0'
           pkg-manager: npm

package.json

@@ -34,7 +34,7 @@
     "eslint": "^7.31.0",
     "express": "^4.17.1",
     "md5": "^2.3.0",
-    "mocha": "^8.4.0",
+    "mocha": "^9.2.0",
     "nyc": "^15.1.0",
     "rimraf": "^3.0.2",
     "supertest": "^4.0.2"