Move serverless to dependencies

Author: tcbyrd

package.json

@@ -10,13 +10,15 @@
     "type": "git",
     "url": "git+https://github.com/probot/serverless-lambda.git"
   },
+  "dependencies": {
+    "serverless": "^1.26.0",
+    "serverless-offline": "^3.20.0"
+  },
   "devDependencies": {
     "standard": "^10.0.3"
   },
   "peerDependencies": {
-    "probot": "^6.1.0",
-    "serverless": "^1.26.0",
-    "serverless-offline": "^3.20.0"
+    "probot": "^6.1.0"
   },
   "engines": {
     "node": ">= 8.10.0",