chore: bump deps

Author: daviddias

package.json

@@ -41,12 +41,12 @@
   "homepage": "https://github.com/ipfs/js-ipfs-unixfs-engine#readme",
   "devDependencies": {
     "aegir": "^12.1.3",
-    "ajv" : "^5.0.0",
+    "ajv": "^5.3.0",
     "chai": "^4.1.2",
     "dirty-chai": "^2.0.1",
     "ipfs": "~0.26.0",
     "ipfs-block-service": "~0.13.0",
-    "ipfs-repo": "0.18.2",
+    "ipfs-repo": "0.18.3",
     "ncp": "^2.0.0",
     "pre-commit": "^1.2.2",
     "pull-generate": "^2.2.0",