Fix security issues with dependencies

Author: maoberlehner

package.json

@@ -29,18 +29,18 @@
   },
   "devDependencies": {
     "@avalanche/eslint-config": "^4.0.0",
-    "@babel/core": "^7.5.5",
-    "@babel/preset-env": "^7.5.5",
+    "@babel/core": "^7.6.4",
+    "@babel/preset-env": "^7.6.3",
     "@vue/test-utils": "1.0.0-beta.29",
     "babel-core": "^7.0.0-bridge.0",
     "babel-jest": "^24.9.0",
-    "coveralls": "^3.0.6",
-    "eslint": "^6.2.1",
+    "coveralls": "^3.0.7",
+    "eslint": "^6.5.1",
     "eslint-plugin-compat": "^3.3.0",
     "eslint-plugin-import": "^2.18.2",
-    "eslint-plugin-markdown": "^1.0.0",
+    "eslint-plugin-markdown": "^1.0.1",
     "jest": "^24.9.0",
-    "rollup": "^1.19.4",
+    "rollup": "^1.25.2",
     "rollup-plugin-babel": "^4.3.3",
     "uglify-es": "^3.3.9",
     "vue": "^2.6.10",