Update development dependencies

package.json

@@ -25,19 +25,19 @@
     "index.d.ts"
   ],
   "devDependencies": {
-    "@babel/core": "^7.5.5",
-    "babel-preset-github": "^3.2.0",
+    "@babel/core": "^7.6.2",
+    "babel-preset-github": "^3.2.1",
     "chai": "^4.2.0",
-    "eslint": "^6.1.0",
-    "eslint-plugin-github": "^3.1.0-beta.2",
-    "flow-bin": "^0.104.0",
-    "karma": "^4.2.0",
+    "eslint": "^6.5.1",
+    "eslint-plugin-github": "^3.1.3",
+    "flow-bin": "^0.109.0",
+    "karma": "^4.3.0",
     "karma-chai": "^0.1.0",
-    "karma-chrome-launcher": "^3.0.0",
+    "karma-chrome-launcher": "^3.1.0",
     "karma-mocha": "^1.3.0",
     "karma-mocha-reporter": "^2.2.5",
-    "mocha": "^6.2.0",
-    "rollup": "^1.17.0",
+    "mocha": "^6.2.1",
+    "rollup": "^1.23.1",
     "rollup-plugin-babel": "^4.3.3"
   },
   "eslintIgnore": [