Remove support for old node versions

.editorconfig

@@ -9,7 +9,7 @@ charset = utf-8
 insert_final_newline = true
 trim_trailing_whitespace = true
 indent_style = space
-indent_size = 4
+indent_size = 2
 max_line_length = 120
 
 [Makefile]

appveyor.yml

@@ -11,6 +11,8 @@ environment:
     - nodejs_version: 5
     - nodejs_version: 6
     - nodejs_version: 7
+    - nodejs_version: 8
+    - nodejs_version: 9
 
 install:
   # Get the latest stable version of Node.js

circle.yml

@@ -1,11 +1,14 @@
 test:
   override:
-    - nvm install 0.10.48 && npm run test-only
-    - nvm install 0.11.16 && npm run test-only
-    - nvm install 0.12.18 && npm run test-only
-    - nvm install 4.7.2 && npm run test
+    - nvm install 4.8.7 && npm run test
     - nvm install 5.12.0 && npm run test
-    - nvm install 6.9.4 && npm run test
-    - nvm install 7.4.0 && npm run test
+    - nvm install 6.13.0 && npm run test
+    - nvm install 7.10.1 && npm run test
+    - nvm install 8.9.4 && npm run test
   post:
-    - chmod +x ./bin/codacy-coverage.js && cat ./coverage/lcov.info | node ./bin/codacy-coverage.js
+    - nvm install 9.6.1
+    - nvm alias default v9.6.1
+    - nvm use default
+    - npm run test-all
+    - chmod +x ./bin/codacy-coverage.js
+    - cat ./coverage/lcov.info | node ./bin/codacy-coverage.js

package.json

@@ -27,6 +27,9 @@
   "bin": {
     "codacy-coverage": "./bin/codacy-coverage.js"
   },
+  "engines": {
+    "node": ">= 4.0.0"
+  },
   "dependencies": {
     "bluebird": "^3.5.x",
     "commander": "^2.x",
@@ -49,7 +52,9 @@
     "eslint": "^4.x"
   },
   "scripts": {
-    "test": "istanbul cover node_modules/mocha/bin/_mocha -- --check-leaks  --timeout 30000 --reporter spec test/ && eslint . && nsp check",
-    "test-only": "istanbul cover node_modules/mocha/bin/_mocha -- --check-leaks  --timeout 30000 --reporter spec test/ && nsp check"
+    "lint-style": "eslint .",
+    "lint-dependencies": "nsp check",
+    "test": "istanbul cover node_modules/mocha/bin/_mocha -- --check-leaks  --timeout 30000 --reporter spec test/",
+    "test-all": "npm run lint-style && npm run lint-dependencies && npm run test"
   }
 }