Update travis config.

Author: Belema Gancarz

.travis.yml

@@ -1,4 +1,6 @@
-before_script: "npm install --dev"
+before_script:
+    - "npm install -g npm"
+    - "npm install --dev"
 script:
     - "npm run lint"
     - "npm test"

npm-debug.log

@@ -0,0 +1,38 @@
+0 info it worked if it ends with ok
+1 verbose cli [ 'node',
+1 verbose cli   'C:\\Users\\BVG\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js',
+1 verbose cli   'run',
+1 verbose cli   'lint' ]
+2 info using npm@2.12.1
+3 info using node@v0.10.37
+4 verbose run-script [ 'prelint', 'lint', 'postlint' ]
+5 info prelint slug@0.9.1
+6 info lint slug@0.9.1
+7 verbose unsafe-perm in lifecycle true
+8 info slug@0.9.1 Failed to exec lint script
+9 verbose stack Error: slug@0.9.1 lint: `jshint slug.js`
+9 verbose stack Exit status 2
+9 verbose stack     at EventEmitter.<anonymous> (C:\Users\BVG\AppData\Roaming\npm\node_modules\npm\lib\utils\lifecycle.js:213:16)
+9 verbose stack     at EventEmitter.emit (events.js:98:17)
+9 verbose stack     at ChildProcess.<anonymous> (C:\Users\BVG\AppData\Roaming\npm\node_modules\npm\lib\utils\spawn.js:24:14)
+9 verbose stack     at ChildProcess.emit (events.js:98:17)
+9 verbose stack     at maybeClose (child_process.js:766:16)
+9 verbose stack     at Process.ChildProcess._handle.onexit (child_process.js:833:5)
+10 verbose pkgid slug@0.9.1
+11 verbose cwd E:\Git\node-slug
+12 error Windows_NT 6.2.9200
+13 error argv "node" "C:\\Users\\BVG\\AppData\\Roaming\\npm\\node_modules\\npm\\bin\\npm-cli.js" "run" "lint"
+14 error node v0.10.37
+15 error npm  v2.12.1
+16 error code ELIFECYCLE
+17 error slug@0.9.1 lint: `jshint slug.js`
+17 error Exit status 2
+18 error Failed at the slug@0.9.1 lint script 'jshint slug.js'.
+18 error This is most likely a problem with the slug package,
+18 error not with npm itself.
+18 error Tell the author that this fails on your system:
+18 error     jshint slug.js
+18 error You can get their info via:
+18 error     npm owner ls slug
+18 error There is likely additional logging output above.
+19 verbose exit [ 1, true ]