- update dependencies

- update snapshot tests to use enzyme-to-json
- add constants to test files
- update README

Author: calebpollman

.gitignore

@@ -19,7 +19,3 @@
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*
-
-# post
-/post
-old_post.md

README.md

@@ -1,5 +1,7 @@
 # TDD React
 
+A simple Calculator app created for a blog post at [testdriven.io](https://testdriven.io/blog/tdd-with-react-jest-and-enzyme-part-one/).
+
 ## Local Setup
 
 ```sh
@@ -11,17 +13,17 @@ $ cd react-calculator
 ```
 
 ```sh
-$ yarn install
+$ npm install
 ```
 
 ## Run Locally
 
 ```sh
-$ yarn start
+$ npm start
 ```
 
 ## Run Tests
 
 ```sh
-$ yarn test
+$ npm test
 ```