chore: add .editorconfig

.editorconfig

@@ -0,0 +1,9 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+trim_trailing_whitespace = true
+charset = utf-8
+indent_style = space
+indent_size = 2

package.json

@@ -41,4 +41,4 @@
     "travis-after-all": "^1.4.4",
     "validate-commit-msg": "^2.0.0"
   }
-}
+}

test.js

@@ -7,7 +7,7 @@ require('fs').readFile('./package.json', 'utf8', function (error, contents) {
   }
   var parsed = JSON.parse(contents);
   assert.deepEqual(typeof sortPackageJson(parsed), 'object', 'Accepts object, returns object');
-  assert.equal(JSON.stringify(sortPackageJson(parsed), null, 2), contents, 'Returned object is sorted');
+  assert.equal(JSON.stringify(sortPackageJson(parsed), null, 2) + '\n', contents, 'Returned object is sorted');
   assert.equal(sortPackageJson(contents), contents, 'Accepts string, returns sorted string');
 
   assert.equal(JSON.stringify(sortPackageJson({