Enable coverage via nyc

- dropped node 0.12 and 4
- added node 10 and 12
- added yarn lockfile
- migrated coverage to nyc

.gitignore

@@ -6,6 +6,7 @@
 test/actual
 actual
 coverage
+.nyc_output
 
 # npm
 node_modules

.travis.yml

@@ -1,10 +1,10 @@
 sudo: false
 language: node_js
 node_js:
-  - node
+  - 'node'
+  - '12'
+  - '10'
+  - '8'
   - '6'
-  - '0.10'
-  - '0.12'
-  - 4
-  - 6
-script: make test-ci
+script: yarn test-ci
+after_success: yarn coverage

Makefile

@@ -26,13 +26,6 @@ test: lint
 	echo "CommonMark stat:\n"
 	./support/specsplit.js test/fixtures/commonmark/spec.txt
 
-coverage:
-	rm -rf coverage
-	istanbul cover node_modules/.bin/_mocha
-
-test-ci: lint
-	istanbul cover ./node_modules/mocha/bin/_mocha --report lcovonly -- -R spec && cat ./coverage/lcov.info | ./node_modules/coveralls/bin/coveralls.js && rm -rf ./coverage
-
 gh-pages:
 	if [ "git branch --list gh-pages" ]; then \
 		git branch -D gh-pages ; \

package.json

@@ -55,7 +55,9 @@
     "node": ">= 0.10.0"
   },
   "scripts": {
-    "test": "make test"
+    "test": "make test",
+    "test-ci": "nyc mocha -R spec --bail",
+    "coverage": "yarn add coveralls@2 && nyc report --reporter=text-lcov | coveralls"
   },
   "dependencies": {
     "argparse": "~0.1.15",
@@ -68,7 +70,8 @@
     "gulp-format-md": "^0.1.10",
     "highlight.js": "^9.7.0",
     "marked": "0.3.2",
-    "mocha": "*"
+    "mocha": "^6.1.4",
+    "nyc": "^14.1.1"
   },
   "keywords": [
     "commonmark",