move proxyquire to dev deps

Author: matt-oc

package.json

@@ -35,7 +35,6 @@
   "license": "MIT",
   "dependencies": {
     "github4": "0.5.4",
-    "proxyquire": "1.7.4",
     "request": "2.70.0",
     "seneca": "2.0.0",
     "seneca-balance-client": "0.4.0",
@@ -50,6 +49,7 @@
     "eslint-config-seneca": "1.1.2",
     "eslint-plugin-hapi": "4.0.0",
     "eslint-plugin-standard": "1.3.2",
+    "proxyquire": "1.7.4",
     "lab": "10.3.1"
   }
 }