Test eslint 3 and 2 on travis (babel/babel-eslint#340)

closes babel/babel-eslint#332

eslint/babel-eslint-parser/.travis.yml

@@ -1,11 +1,24 @@
----
 git:
   depth: 1
 sudo: false
 language: node_js
-node_js:
-  - "0.10"
-  - "0.12"
-  - "4"
-  - "5"
-  - "6"
+before_install:
+  - sh -c "if [ '$ESLINT_VERSION' = '2' ]; then npm i --save-dev eslint@2; fi"
+matrix:
+  include:
+    - node_js: "0.10"
+      env: ESLINT_VERSION=2
+    - node_js: "0.12"
+      env: ESLINT_VERSION=2
+    - node_js: "4"
+      env: ESLINT_VERSION=2
+    - node_js: "4"
+      env: ESLINT_VERSION=3
+    - node_js: "5"
+      env: ESLINT_VERSION=2
+    - node_js: "5"
+      env: ESLINT_VERSION=3
+    - node_js: "6"
+      env: ESLINT_VERSION=2
+    - node_js: "6"
+      env: ESLINT_VERSION=3

eslint/babel-eslint-parser/package.json

@@ -34,7 +34,7 @@
   },
   "homepage": "https://github.com/babel/babel-eslint",
   "devDependencies": {
-    "eslint": "^2.4.0",
+    "eslint": "^3.0.0",
     "espree": "^3.0.0",
     "mocha": "^2.3.3"
   }