drop node v6; update dev dependencies

Author: andrew-coleman

.travis.yml

@@ -3,7 +3,6 @@ node_js:
 - '12'
 - '10'
 - '8'
-- '6'
 after_success:
 - npm run coveralls
 jobs:

package.json

@@ -39,25 +39,25 @@
     "path"
   ],
   "devDependencies": {
-    "@babel/cli": "^7.2.0",
-    "@babel/core": "^7.2.2",
-    "@babel/preset-env": "^7.2.0",
-    "browserify": "^16.1.0",
-    "chai": "^4.1.2",
+    "@babel/cli": "^7.6.2",
+    "@babel/core": "^7.6.2",
+    "@babel/preset-env": "^7.6.2",
+    "browserify": "^16.5.0",
+    "chai": "^4.2.0",
     "chai-as-promised": "^7.1.1",
-    "coveralls": "^3.0.0",
-    "eslint": "^5.15.3",
+    "coveralls": "^3.0.6",
+    "eslint": "^6.5.1",
     "eslint-plugin-ideal": "^0.1.3",
     "istanbul": "^0.4.5",
-    "jsdoc": "^3.4.0",
+    "jsdoc": "^3.6.3",
     "mkdirp": "^0.5.1",
-    "mocha": "^6.0.2",
-    "mocha-lcov-reporter": "^1.2.0",
-    "regenerator": "^0.13.2",
-    "request": "^2.81.0",
-    "uglify-es": "^3.0.20"
+    "mocha": "^6.2.1",
+    "mocha-lcov-reporter": "^1.3.0",
+    "regenerator": "^0.14.2",
+    "request": "^2.88.0",
+    "uglify-es": "^3.3.9"
   },
   "engines": {
-    "node": ">= 6"
+    "node": ">= 8"
   }
 }

src/parser.js

@@ -185,7 +185,7 @@ const parser = (() => {
                 return create('operator', '~>');
             }
             // test for single char operators
-            if (operators.hasOwnProperty(currentChar)) {
+            if (Object.prototype.hasOwnProperty.call(operators, currentChar)) {
                 position++;
                 return create('operator', currentChar);
             }
@@ -200,7 +200,7 @@ const parser = (() => {
                     if (currentChar === '\\') { // escape sequence
                         position++;
                         currentChar = path.charAt(position);
-                        if (escapes.hasOwnProperty(currentChar)) {
+                        if (Object.prototype.hasOwnProperty.call(escapes, currentChar)) {
                             qstr += escapes[currentChar];
                         } else if (currentChar === 'u') {
                             // \u should be followed by 4 hex digits
@@ -280,7 +280,7 @@ const parser = (() => {
             var ch;
             for (; ;) {
                 ch = path.charAt(i);
-                if (i === length || ' \t\n\r\v'.indexOf(ch) > -1 || operators.hasOwnProperty(ch)) {
+                if (i === length || ' \t\n\r\v'.indexOf(ch) > -1 || Object.prototype.hasOwnProperty.call(operators, ch)) {
                     if (path.charAt(position) === '$') {
                         // variable reference
                         name = path.substring(position + 1, i);