Update dependencies and add yarn.lock (#144)

* Update dependencies and add yarn.lock

* Add node 6 and 7

Author: danez

.travis.yml

@@ -1,7 +1,7 @@
 sudo: required
 language: node_js
 node_js:
-  - 4
-  - 5
-  - stable
+  - "4"
+  - "6"
+  - "7"
 script: npm run check

package.json

@@ -32,23 +32,23 @@
     "babel-runtime": "^6.9.2",
     "babylon": "~5.8.3",
     "commander": "^2.9.0",
-    "doctrine": "^1.2.0",
+    "doctrine": "^2.0.0",
     "node-dir": "^0.1.10",
     "recast": "^0.11.5"
   },
   "devDependencies": {
     "babel-cli": "^6.9.0",
     "babel-eslint": "^7.0.0",
-    "babel-jest": "^16.0.0",
+    "babel-jest": "^17.0.2",
     "babel-plugin-syntax-flow": "^6.8.0",
     "babel-plugin-transform-flow-strip-types": "^6.8.0",
     "babel-plugin-transform-runtime": "^6.9.0",
     "babel-preset-es2015": "^6.9.0",
     "babel-preset-stage-1": "^6.5.0",
-    "cross-spawn": "^4.0.0",
+    "cross-spawn": "^5.0.0",
     "eslint": "^3.2.2",
-    "flow-bin": "^0.33.0",
-    "jest": "^16.0.1",
+    "flow-bin": "^0.37.0",
+    "jest": "^17.0.3",
     "rimraf": "^2.3.2",
     "temp": "^0.8.1"
   },