updating DEV deps

.travis.yml

@@ -1,7 +1,7 @@
 language: node_js
 matrix:
   include:
-    - node_js: "6"
+    - node_js: "8"
       script: "npm test"
     - node_js: "10"
       script: "npm test"

package.json

@@ -1,6 +1,6 @@
 {
   "name": "sub-events",
-  "version": "1.3.1",
+  "version": "1.3.2",
   "description": "Lightweight, strongly-typed events, with monitored subscriptions.",
   "main": "dist/src/index.js",
   "types": "dist/src/index.d.ts",
@@ -29,8 +29,7 @@
   },
   "license": "MIT",
   "engines": {
-    "node": ">=4.5",
-    "npm": ">=2.15"
+    "node": ">=8.0.0"
   },
   "bugs": {
     "url": "https://github.com/vitaly-t/sub-events/issues"
@@ -49,20 +48,20 @@
     "typescript"
   ],
   "devDependencies": {
-    "@types/chai": "4.2.3",
+    "@types/chai": "4.2.8",
     "@types/chai-spies": "1.0.1",
-    "@types/mocha": "5.2.7",
-    "@types/node": "12.11.2",
+    "@types/mocha": "7.0.1",
+    "@types/node": "13.7.0",
     "browserify": "16.5.0",
     "chai": "4.2.0",
     "chai-spies": "1.0.0",
-    "coveralls": "3.0.7",
-    "mocha": "6.2.2",
+    "coveralls": "3.0.9",
+    "mocha": "7.0.1",
     "mocha-lcov-reporter": "1.3.0",
-    "nyc": "14.1.1",
-    "ts-node": "8.4.1",
-    "tslint": "5.20.0",
-    "typedoc": "0.15.0",
-    "typescript": "3.6.4"
+    "nyc": "15.0.0",
+    "ts-node": "8.6.2",
+    "tslint": "6.0.0",
+    "typedoc": "0.16.9",
+    "typescript": "3.7.5"
   }
 }