chore: update deps and lint style

No change to logic. This updates dependencies and upgrades the lint
style to es6.

Author: nfischer

.eslintrc.json

@@ -2,16 +2,22 @@
   "env": {
     "node": true
   },
-  "extends": "airbnb-base/legacy",
+  "extends": "airbnb-base",
   "rules": {
     "comma-dangle": 0,
-    "global-require": 0,
-    "vars-on-top": 0,
-    "spaced-comment": [2, "always", { "markers": ["@", "@include"], "exceptions": ["@"] }],
-    "no-param-reassign": 0,
-    "no-console": 0,
     "curly": 0,
     "func-names": 0,
+    "global-require": 0,
+    "import/order": 0,
+    "no-console": 0,
+    "no-else-return": 0,
+    "no-param-reassign": 0,
+    "no-plusplus": 0,
+    "no-var": 0,
+    "prefer-arrow-callback": 0,
+    "prefer-template": 0,
+    "spaced-comment": [2, "always", { "markers": ["@", "@include"], "exceptions": ["@"] }],
+    "vars-on-top": 0,
     "new-cap": [2, {
       "capIsNewExceptions": [
         "ShellString"