Update Test & linting packages

Author: renovate-bot

ghost/pretty-cli/package.json

@@ -20,9 +20,9 @@
     "access": "public"
   },
   "devDependencies": {
-    "mocha": "6.1.3",
+    "mocha": "6.1.4",
     "should": "13.2.3",
-    "sinon": "7.3.1"
+    "sinon": "7.3.2"
   },
   "dependencies": {
     "chalk": "^2.4.1",

ghost/release-utils/package.json

@@ -18,9 +18,9 @@
     "access": "public"
   },
   "devDependencies": {
-    "mocha": "6.1.3",
+    "mocha": "6.1.4",
     "should": "13.2.3",
-    "sinon": "7.3.1"
+    "sinon": "7.3.2"
   },
   "dependencies": {
     "bluebird": "^3.5.3",