Merge pull request #387 from ipfs/remove-unused

chore: remove unused devDependency: mocha

Author: daviddias

package.json

@@ -50,7 +50,6 @@
     "interface-ipfs-core": "^0.3.0",
     "left-pad": "^1.1.0",
     "lodash": "^4.11.2",
-    "mocha": "^2.5.1",
     "ncp": "^2.0.0",
     "nexpect": "^0.5.0",
     "pre-commit": "^1.1.2",