Updates deps and docs.

Author: ctrlplusb

.flowconfig

@@ -40,4 +40,4 @@ suppress_comment= \\(.\\|\n\\)*\\$FlowIgnore
 suppress_comment= \\(.\\|\n\\)*\\$FlowFixMe
 
 [version]
-0.37.4
+0.38.0

README.md

@@ -79,7 +79,7 @@ function visitor(element, instance, context) {
   }
 };
 
-reactTreeWalker(tree, visitor);
+reactTreeWalker(app, visitor);
 
 console.log(values); // [1, 2, 4, 5, 3];
 ```

package.json

@@ -42,28 +42,28 @@
   },
   "devDependencies": {
     "app-root-dir": "1.0.2",
-    "babel-cli": "6.18.0",
-    "babel-core": "6.21.0",
+    "babel-cli": "6.22.2",
+    "babel-core": "6.22.1",
     "babel-eslint": "7.1.1",
     "babel-jest": "18.0.0",
     "babel-loader": "6.2.10",
-    "babel-polyfill": "6.20.0",
+    "babel-polyfill": "6.22.0",
     "babel-preset-env": "1.1.8",
-    "babel-preset-latest": "6.16.0",
-    "babel-preset-react": "6.16.0",
-    "babel-preset-stage-3": "6.17.0",
-    "babel-register": "6.18.0",
+    "babel-preset-latest": "6.22.0",
+    "babel-preset-react": "6.22.0",
+    "babel-preset-stage-3": "6.22.0",
+    "babel-register": "6.22.0",
     "codecov": "1.0.1",
     "cross-env": "3.1.4",
-    "enzyme": "2.7.0",
+    "enzyme": "2.7.1",
     "enzyme-to-json": "1.4.5",
-    "eslint": "3.13.1",
+    "eslint": "3.14.0",
     "eslint-config-airbnb": "14.0.0",
     "eslint-plugin-flowtype": "2.30.0",
     "eslint-plugin-import": "2.2.0",
     "eslint-plugin-jsx-a11y": "3.0.2",
     "eslint-plugin-react": "6.9.0",
-    "flow-bin": "0.37.4",
+    "flow-bin": "0.38.0",
     "flow-coverage-report": "0.2.0",
     "flow-typed": "2.0.0",
     "ghooks": "2.0.0",