build: remove osx test

Author: hex7c0

.travis.yml

@@ -5,9 +5,15 @@ node_js:
   - "5"
   - "6"
   - "7"
+matrix:
+  include:
+    - node_js: "8"
+      dist: trusty
+      env: "NVM_NODEJS_ORG_MIRROR=https://nodejs.org/download/nightly"
+  allow_failures:
+    - env: "NVM_NODEJS_ORG_MIRROR=https://nodejs.org/download/nightly"
 os:
   - linux
-  - osx
 cache:
   directories:
     - node_modules

README.md

@@ -1,7 +1,7 @@
 # [mongodb-backup](https://github.com/hex7c0/mongodb-backup)
 
 [![NPM version](https://img.shields.io/npm/v/mongodb-backup.svg)](https://www.npmjs.com/package/mongodb-backup)
-[![Linux Status](https://img.shields.io/travis/hex7c0/mongodb-backup.svg?label=linux-osx)](https://travis-ci.org/hex7c0/mongodb-backup)
+[![Linux Status](https://img.shields.io/travis/hex7c0/mongodb-backup.svg?label=linux)](https://travis-ci.org/hex7c0/mongodb-backup)
 [![Windows Status](https://img.shields.io/appveyor/ci/hex7c0/mongodb-backup.svg?label=windows)](https://ci.appveyor.com/project/hex7c0/mongodb-backup)
 [![Dependency Status](https://img.shields.io/david/hex7c0/mongodb-backup.svg)](https://david-dm.org/hex7c0/mongodb-backup)
 [![Coveralls](https://img.shields.io/coveralls/hex7c0/mongodb-backup.svg)](https://coveralls.io/r/hex7c0/mongodb-backup)