Really really fix broken dependency

Author: ierceg

package.json

@@ -30,14 +30,12 @@
   "dependencies": {
     "debug": "^2.6.0",
     "lodash": "^4.17.2",
-    "selectn": "^1.1.1"
+    "selectn": "^1.1.1",
+    "node-docker-api": "1.1.2"
   },
   "engines": {
     "node": ">=6"
   },
-  "peerDependencies": {
-    "node-docker-api": "^1.1.2"
-  },
   "devDependencies": {
     "mocha": "^3.2.0",
     "nock": "github:ierceg/nock#promisify-nock-back",