Revert "Pin eslint and friends to versions used by Nate to avoid `peer invalid: ajv@^5.0.0, required by ajv-keywords@2.1.1`"

This reverts commit 23bb3439ce4b606f5e3ef8a20ed98042a7f60a0c.

services/chat/package.json

@@ -29,24 +29,23 @@
   "devDependencies": {
     "bunyan": "^1.0.0",
     "chai": "",
-    "eslint": "5.10.0",
-    "eslint-config-prettier": "3.3.0",
-    "eslint-config-standard": "12.0.0",
-    "eslint-config-standard-jsx": "6.0.2",
-    "eslint-config-standard-react": "7.0.2",
-    "eslint-plugin-chai-expect": "2.0.1",
-    "eslint-plugin-chai-friendly": "0.4.1",
-    "eslint-plugin-import": "2.14.0",
-    "eslint-plugin-jsx-a11y": "6.1.2",
-    "eslint-plugin-mocha": "5.2.0",
-    "eslint-plugin-node": "8.0.0",
-    "eslint-plugin-prettier": "3.0.0",
-    "eslint-plugin-promise": "4.0.1",
-    "eslint-plugin-react": "7.11.1",
-    "eslint-plugin-standard": "4.0.0",
+    "eslint": "^5.11.1",
+    "eslint-config-prettier": "^3.3.0",
+    "eslint-config-standard": "^12.0.0",
+    "eslint-config-standard-jsx": "^6.0.2",
+    "eslint-config-standard-react": "^7.0.2",
+    "eslint-plugin-chai-expect": "^2.0.1",
+    "eslint-plugin-chai-friendly": "^0.4.1",
+    "eslint-plugin-import": "^2.14.0",
+    "eslint-plugin-jsx-a11y": "^6.1.2",
+    "eslint-plugin-mocha": "^5.2.0",
+    "eslint-plugin-node": "^8.0.0",
+    "eslint-plugin-prettier": "^3.0.1",
+    "eslint-plugin-promise": "^4.0.1",
+    "eslint-plugin-react": "^7.12.2",
+    "eslint-plugin-standard": "^4.0.0",
     "mocha": "^4.1.0",
     "nodemon": "^1.14.11",
-    "prettier-eslint-cli": "4.7.1",
     "sandboxed-module": "",
     "sinon": "",
     "timekeeper": ""